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Superior protection for your golf bunkers

Capillary Bunkers is the full-scale bunker system ensuring enduring quality for players and ease of maintenance for the crew by providing optimal drainage and moisture rate in the bunker sand

Don’t settle for just a liner - take advantage of our full-scale Bunker Technology System that’s designed to protect your bunkers, keep just the right moisture level and ensure optimal drainage so you can enjoy pristine bunkers and perfect playability all year round

15 year performance guarantee
Easy installation
Drains 100 inches per hour
Installation available worldwide

The complete bunker protection system

The system harnesses the proprietary Capillary Material’s exceptional capabilities to maintain optimal moisture levels and provide rapid drainage, all while ensuring unparalleled durability and strength. Here is how it all ties together.

Download bunker booklet and learn more

Capillary Edge -
Maintaining design integrity

The Capillary Edge guarantees that the bunker’s shape will remain true to its original design throughout its lifespan. This stability reduces the crew’s need for edge trimming and negates the necessity for remodeling or reshaping bunker edges every decade.

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Capillary Bunker Liner - Mastering drainage and moisture retention

Thanks to its proprietary Capillary Material, the Capillary Bunker Liner excels at swiftly draining excess water while simultaneously retaining the right amount of moisture. This ensures impeccable playing conditions in any weather and across all terrains, while also preventing the washouts and maintenance headaches typically associated with bunker upkeep.

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Capillary Wash Box -
Restoring sand to its optimal state

The Capillary Wash Box is an effective solution for washing algae, debris, silt, clay, and organic pollutants from bunker sand. By doing so, it preserves the sand’s percolation rate, color, and desired playing properties, while it is also eliminating the need for frequent sand replacement.

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+1500 satisfied customers worldwide

We are proud to have constructed some of the world's top 100 golf courses, from Ryder Cup to PGA venues. Here are what some of them say about us and our bunker liner:

Hoover Country Club

LJ Robinson

The Wash Box is a huge deal for us. In the past, after a flood, we would skim our bunkers with flat shovels, but there was always some muck left over. With the Wash Box, we can skim, then connect a hose to the irrigation system and blast out the rest of the contamination. It will make a HUGE difference for us!

Castelconturbia GC

Giovanni Malcotti

When our contractor explained the benefits of the Wash Box to us, it was an easy decision to add it, one we took in an instant. It was a complete no brainer and we are happy with how it has helped us restore the sand colour without removing or adding any new sand!

Delsjö GK

Kevin Collins

Keeping our sands clean with the soils we have always has been a huge problem. Regardless of how good your construction is, you will always get contaminations in the sand here: clippings, algae, clay and silt run-offs and the like. This is the first solution we have ever seen work where we do not have to replace the sand. I'm stunned by the results and also all the money we save on sand!

The Breakers Palm Beach

Mark Reid

I am a big fan of the Wash Box. To have the ability to remove fines and algae, and bring sand back to its original pure-white state is amazing. I’m never worried about bunker consistency now!

Croasdaile Country Club

Golf Course Updates:

The rain total for yesterday was 2 inches. It was a great test for the renovated bunkers and they handled it flawlessly!

Below is an old bunker verses one that was rebuilt.

Whitecraigs Golf Club

Whitecraigs Golf Club

Not a brilliant morning weather wise, but delighted at how the course has held up to an inch of rain since we left yesterday.  Greens drainage and capillary concrete bunkers are performing well.

Headland Golf Club

Ben Tilley

When 38mm “floggs down” overnight & 55mm over 3 days & then you come in to find your decision making, choices of product and planning have been vindicated 😎😎😎

Ayla Golf Club

Atilla Demisroy

Keeping the white silica bunker sand and the orange/brown desert sand separate is essential if bunker performance is to be maintained, and this requires a quality liner. We need separation to keep the integrity of our bunkers. CapillaryFlow was the only option to fix this.

Oakwing Golf Club

Kyle Swart

Before we started, around fifty per cent of our bunkers simply didn’t drain. In the first three months after we renovated, we had 22 inches of rain–we went from an incredibly dry summer to an incredibly wet winter. There is not a bunker out there that has held water or washed out, or retained any silt. They have been the best addition to this golf course.

We are going to save $50-70,000 a year just on labour from the new bunkers, and there will be another $12-15,000 from not having to replace sand. For us, that is a big, big difference.

Clearwater Bay Golf

Peter John Downie

After 250mm of rain, no washout, no nothing. The Bunkers we didn't redo, a complete mess. Washed out, right down to the sand mat, completely depressing for the staff. After this, we will redo all our bunkers with Capillary!

Newnan Country Club

Andy Scott

We’ve had three big rainstorms – three inches overnight – since we finished the installation, and we have come in the following morning and found little or no washouts in our new bunkers. Member reaction has been great. I’m getting compliments every single day about how they look and play. It’s probably too early to say this is the best decision of my life, but I’m pretty close to it.

The Club at Gettysvue

Jeff Dudych

During my travels I’ve seen all the liners and from talking to my colleagues, it was clear that the Capillary Bunkers stood up the best.

Wakefield Plantation Country Club

Todd Lawrence

I like the fact that the concrete is a homogenous two inch layer. Other products seemed to depend much more on the contractor to get the consistency and depth of the product right. With Capillary Bunkers, I knew that as long as it came out of the truck properly mixed, it would give me that solid two inch layer.

Sarabay Country Club

Carlyle Merring

We had ten inches of rain over the course of thirty days in June, and seven of those inches came down in two days,” says golf course superintendent Carlyle Merring. “The bunkers stood up to it really well. We don’t have a problem with them washing out. The integrity of the product is holding strong – not failing in any sort of way, and the bunkers are functioning really well. Generally we can get our bunkers back in play in one morning after a big rain event.

Kinderlou Forest Golf Club

Heath Allen

We want to do this one time and not have to worry about going back in to replace anything. And the Capillary sytem is very easy to install – there are very few restrictions about suitable weather, or time of day, and so on.

Cuscowilla Country Club

Jarrod Clark

After 20 years of weathering and maintenance our bunkers were in need of renovation. We have a natural style of bunkering and wanted to keep that look intact while installing new sand and drainage. Using Capillary Concrete on our steep faces allowed us to stabilize and drain the bunkers while keeping the design and look intact. We have experienced less washouts and better playability since the Capillary Concrete installation. Our members have been very happy with the consistency of the new bunkers that are now playable sooner after heavy rainfall

Flying Horse Club

Phil Smith

I have had great experiences with Capillary Concrete, so it was an easy decision for this project. I have found the Capillary Concrete to deliver very good results in terms of sand quality, and the easy of installation just closes the deal as far as i’m concerned. I really can’t say enough about it.

Gamle Fredrikstad Golfklubb

Agne Strom

I dug up the sand today in one of our bunkers. I am turning it into a chipping area by green #7. After 3 trouble-free seasons and 2 winters I can testify of zero damage to my Capillary Concrete. I strongly recommend this product! Never a wash-out. I spend about 10 hours per week on my 45 bunkers and that's it.

University of Texas Golf Club

Tyler Andersen

As a staff, we needed to find a way to retain moisture in the faces of the bunkers so golf shots would hit and release to the bottoms of the bunker. Capillary Bunkers with its two-way moisture control was the only liner who could provide this. We couldn't be happier for our bunkers!

The Preserve Golf Club

Steven Miles

All of our bunkers were completely redone with Capillary Concrete back in 2014. We got 100 inches of rain the last 2 years and for the last 4 to 5 years we have not had to replace any sand. We have less labor fixing washouts… we have to rake our bunkers fewer times… so it saves us a substantial amount of money for labor.

We have not had to repair our bunkers at all, and, incredibly, the original sand is still in them. Since 2014, I have bought one truckload of sand, and that was for the bunker in our chipping green – which gets blasted out by players. Our bunkers have flashed sand faces, but our minimal washout issues only occur where water actually flows into the bunkers. When we get a big rain – and eight to ten inches of rain is not uncommon – we have to wait for the drainage infrastructure underneath the bunkers to catch up with the bunkers’ ability to move water. But it always does, and then the crew can prepare the bunkers for play again.

Avondale Golf Club

David Warwick

We have recently made the huge decision to renovate all the bunkers at Avondale Golf Club, utilizing Capillary Concrete™ as the primary bunker liner and the patent pending drip line irrigation technique on the steeper faces. We are extremely impressed with the effectiveness of the product.

Palmetto Golf Club

Brooks Blackburn

It’s been a game changer for us.

Le Golf National, Paris, France

Alejando Reyes

We have selected Capillary Bunkers with special Light Weight Aggregates based on the outstanding performance and strength of the material. After several tests and on site evaluations, it is the best adapted product to our renovation project in order to produce a world class golf venue

Spot the difference

A solution engineered to solve your biggest bunker problems

No waterlogged bunkers with high drainage rate

Drains with a rate of 100 inches per hour

No clogging of drainage layers

Robust and dense liner able to stand +1000 PSI protects the drainage

Eliminate washouts

Rapid drainage of 100 inches per hour and moisturized bunker sand in drier conditions protects the bunker from washouts and plugged ball liesbelow

Keep sand on faces

Patented Capillary Material moisturize the sand from

Less sand contamination from soil

Strong edge, durable liner and good drainage reduces contamination from adjacent soil. If it gets contaminated, you can wash it instead of replacing it

Significantly less maintenance

Decrease hours spent in bunkers with ⅔

Learn how Desert Mountain Golf Club saved 2,300 maintenance hours per year

Completely eliminate sand replacements

The only bunker liner with the possibility to wash the sand to new again

Significantly increase the longevity of your bunker sand by washing it. The Capillary Wash Box is an effective solution for washing algae, debris, silt, clay, and organic pollutants from bunker sand. By doing so, it preserves the sand’s percolation rate, color, and desired playing properties while eliminating the need for frequent sand replacement


Capillary Bunkers: A risk-free decision for you and your club with a +25 year lifespan

The bunker system & liner with the best ROI and long-term performance

By eliminating frequent sand touch ups and occasional sand & liner replacements, Capillary Bunkers cost a third as much the coming 25 years*, compared to other bunker liner options yet still perform the same way it did year one.

Download flyer and learn more

*Based on renovating 80 bunkers of total 50,000 sq. ft., with sand price of $80 per short ton and labor price $30 per hour. Liner prices based on USGA data. Contact your CapillaryFlow representative to learn more.

Custom ROi calculations

Interested in what the numbers for your course would look like?

Get your custom ROI calculation and quote
Bunker liner

Capillary Bunkers technology overview

CapillaryFlow’s bunker liner is a homogeneous mix that is installed at a 2 inch (50mm) in a uniform layer across the whole bunker. It’s ASTM tested to withstand pressure of up to +1000 PSI or 6,800 pounds, and drains with a rate of 100 inches (2,500mm) per hour. 


Product is delivered from a local supplier in a concrete truck


Less than 90 minutes per 1,350 ft2 (125 m2)


More than 100 inches (2,500 mm) per hour


Superior strength for all edge options, including optional stacked-sod edges

Area per truckload

1,350 ft2 (125 m2)


2 inches (50 mm)

Void structure

+20% void structure prevents sand migration and ice damage

Expected lifespan of +25 years

With a 15 year performance guarantee

Capillary Edge by CapillaryFlow

bunker edge capillary

Bunker edge

Capillary Edge technology overview

A specialized artificial turf strip is positioned along the edge and integrated with Capillary Material above an impermeable liner, which helps to irrigate and improve the soil just outside the edge. 


5,9" (15cm)
1,2" (3cm)
32' (10m)
One strip is ≈ 49' (15m) long


Patented Capillary Material moisturize the sand from below


2,95" (7.5cm) with grass
2,95" (7.5cm) without grass


$2 per linear feet (30,5 cm)

washing the bunker sand capillary

Washing the bunker sand

Capillary Wash Box technology overview

The Wash Box is ready to be used out of the box and is placed on top of the drain line in the base of the bunker. It takes less than 20 minutes to install and is easy to expose when you want to use it.


Out of the box


Less than
10 minutes per bunker

Washing time

1-2 hours per bunker
depending on bunker size

Washing frequency

When bunkers drain poorly, sand is too dense or visual contamination is present. Recommended at a minimum every 3 years

Sand replacement rate

None as it can be washed to its original properties to maintain desired playability & characteristics

What our golf bunker construction process looks like

With +1500 venues installed worldwide, we have the experience to manage small- to large-scale projects all over the world. Upon receiving your order, we leverage the resources of local suppliers to ensure rapid project initiation.

Our bunker liner is easy to install and can be done either by us, a contractor or your in-house crew. You can install sand and edge within 24 hours.

The process

bunker edge capillary

Step One

Preparative ground work

We provide instructions or help you with preparing the ground by emptying the bunker, preparing edges and verifying or renovating the drainage.

bunker edge capillary

Step Two

Transportation and installation of the bunker system

The Capillary Material is delivered directly to your location in a ready-mix state from local plants. It is ready to be installed right out of the truck and can be done by any crew. It is installed by transporting it to the bunker in smaller vehicles to not damage the course, and distributed evenly with a 2 inch layer across the whole bunker. The Wash box is fitted in the vault and edges on the lips.

bunker edge capillary

Step Three

Installation of sand and functionality test

We then test the functionality. You can install bunker sand 24 hours after installation and the bunker is ready to be used.

bunker edge capillary

Step Four

Enjoy your installation of Capillary with 15 year performance guarantee and full product support

We are proud to be the only industry supplier to offer a full 15 year performance guarantee.

Why choose Capillary Bunkers?

Bunker liner installation

Ease and flexibility of installation

Install it in house or with your contractor of choice

Our bunker liner can be installed by your in-house team with local materials and minimal tools, or by a local contractor.

Do one, many or all your bunkers when it suits you the best

You get the flexibility to schedule installation of one, several or all of your bunkers during your off-season to avoid closing during peak playing seasons and affecting your capital budget.

Patented homogenous mix enables durability and strength

Strongest in the market

Compared to other bunker liners CapillaryFlow is a homogenous mix, providing maximum strength and durability while still draining at an impressive rate of 100 inches per hour.

The Capillary Material is a homogenous mix with equal strength throughout the whole bunker


Unparalleled 15-year performance guarantee

A worry-free vendor choice

We are so confident in the quality of our product why we are proud to offer the only 15-year performance guarantee in the industry for our bunker liner. How it differs? It is not simply a limited product or manufacturer warranty. If the integrity of our product fails, we will replace it for you. Learn more here

The risk-free decision that sets you up for long-term success

Swift ROI

Our bunkers last longer, pay for themselves within 3 years in most cases, and provide better, more consistent playing experiences. With no or minimal sand replacement, you can save up to ⅔ of your bunker’s operating budget over 25 years.

Top of the Rock


Some recent installations we are particularly proud of

The Singapore Island Country Club

Kauri Cliffs, New Zealand

Marco Simone G&CC, host of Ryder Cup 2023

Costa Navarino Golf Resort, Greece

Top of the rock, MI

Le Golf National, France, host of Ryder Cup 2018

Adare Manor, Scotland, Host of Ryder Cup 2027

Frequently asked questions about our bunker liner and protection system

How long does it take to install Capillary Bunkers?

To install the bunker liner in one bunker generally takes between 1 and 2 hours depending on size. The Wash Box is installed at the same time as the liner and should add no more than 15 minutes to the installation process. The Capillary Edge can be installed either in conjunction with installation of the bunker liner or the day after installation of the bunker liner. Installing the Capillary Edge should take no longer than 60 minutes per bunker.

Can I install Capillary’s Bunkers myself or do I need to work with someone certified?

Yes you can install the bunker liner, wash box and edge yourself. You don’t need to find and collaborate with any certified installer. Our product is so easy to install that it can be done with any contractor or your in-house crew.

How much does it cost to line a bunker?

It depends on the size of the bunker, local material prices such as sand & drainage material. To give you an accurate estimate, please contact us and we will happily assist you in providing a price per bunker. 

Can the Capillary Bunker Liner be installed in any geographic location?

Yes it can. When you contact us we utilize our vast geographical presence to either handle the installations ourselves, or with the help of our extensive partner network. As it is easy to use any contractor for installation, or even your in-house team, the liner can be installed regardless of where in the world you are located. 

Regarding temperatures and harsh weather conditions the bunker liner was Engineered in Scandinavia - one of the harshest climates out there. The material has a 23 % void space while water only needs 9 % to expand. This means that it can handle freeze-thaw cycles without problem, isn’t affected by clay-heave expansion and drains precipitation at a high rate. 

We have done installations in over 50 countries and are happy to provide you with references in your proximity.

Can the Wash Box be installed with other bunker liners?

No. The reason for that is simple: No other bunker liner in the market can withstand the high pressure water beam without either displacing too much sand, ripping the bunker liner or damaging it in other ways. The Capillary Material with its superior durability can easily withstand the pressure the water beam creates and wash the sand in its place.

What is the difference between CapillaryFlow’s bunker liner and other bunker liners on the market?

Homogenous mix: No other bunker liner is a homogenous mix with equal strength and durability throughout the whole bunker liner.

No certified installers: We offer you the possibility to work with either your in-house team or a contractor of your choice. The products are easy to install and can be handled by any team. 

Longest life span in the market with washable sand: The bunker liner material itself has an expected lifespan of +25 years, while the sand can be washed to its original state and playing characteristics. Together, this will save you large $ in the long run. 

Non-decreasing performance guarantee: Compared to other bunker liner options, our performance guarantee covers the full replacement of a failed product over 15 years, with no reduction in reimbursement value. It is not a limited warranty or manufacturer’s warranty - we offer full product replacement no questions asked. 

Together with our long-term partners of superintendents, contractors and others involved in the golf construction business we have constructed a Bunker liner comparison guide and a custom ROI calculator. It highlights the long-term impacts of your choice of bunker liner and all costs and compromises associated with it. All, to ensure you make a sound investment decision based on facts and not empty promises. 

Let us know in the form below if you want to get our bunker liner comparison guide, including custom ROI calculations to your course!

Can I do a hybrid bunker?

No, you can’t. CapillaryFlow does not support the Hybrid Method and will not provide support or materials if this is adopted. If it has been installed anyway, the performance guarantee is not valid. 

The single reason CapillaryFlow does not support the Hybrid Method is because it will cause more washouts. As you break the capillary action the drainage relies on, between the intersection of the Capillary Material and the fabric, more water will back up in the porous space in the Capillary Material as it can’t enter your drain lines fast enough. Putting in more drain lines won’t solve the problem. Ultimately, this will cause many more washouts and in extension wet bunker bases due to the contamination. 

Download our Hybrid Method whitepaper to learn more!

Do you offer proof bunkers?

Yes, we do. Contact us to have a custom offer for a demo/proof bunker. We will get back to you with an offer in 24 hours.

We would love to help you with your bunker renovation project or provide custom ROI calculations

Contact us and one of our experts will reach out to you as soon as possible.

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