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SoilFloc Pond Sealant

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Below are the available bulk discount rates for each individual item when you purchase a certain amount

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Soilfloc Polymer Pond Sealant - Apply Through-the-Water

Soilfloc is a polymer based soil sealant that can be applied through the water column to seal soil seepage without draining the pond or reservoir.  It is non-toxic, biodegradable, and has been tested for impacts to aquatic organisms in major University Studies.  It can also be applied during construction to improve the soil's sealing capability.  This is by far the most cost effective method to attempt to seal a pond without completely draining the water.

Soilfloc works best in ponds and reservoirs with widespread seepage or with significant localized leaks.  The polymer works by swelling in soil pores and attracting fine clay particles to further clog the soil.  For larger leaks, pond dye can be an effective tool to observe sub-surface currents and identify the leak area.

The 2-Part polymer based sealant is supplied in a fine granular form.  Each unit includes 55 pounds of Part A and 55 pounds of Part B.  Each 110 pound unit treats approximately 3,000 square feet of pond bottom.  Heavier application rates typically improve effectiveness.

Soilfloc Minimum Application Rate
1/4 acre pond (10,890 sq ft) 4 units of SoilFloc
1/2 acre pond (21,780 sq ft) 8 units of SoilFloc
1 acre pond (43,560 sq ft) 16 units of SoilFloc
2 acre pond (87,120 sq ft) 32 units of SoilFloc
* 1 unit includes 55 lbs of Part A and 55 lb of Part B

Calculate How Much Soilfloc I need with the Pond Sealant Calculator

This Pond Leak Sealant is the best polymer based sealant available for your canal, irrigation ditch or pond. Specifically designed to find leaks, whether in the floor, the wall or through rock formations and seal them. Soilfloc contains linear and cross-linked polymers to seal any type of soil, for any sized project. From large earth-bottom Koi ponds to large natural ponds, farm ponds and lakes, it is an extremely cost effective solution to your water loss problems.

Soil floc Sealant is the product of choice for sealing leaks without dewatering ponds, reservoirs, irrigation ditches, watering holes, golf course water hazards, and residential ponds.

  • Easy to use
  • Cost effective
  • Long lasting
  • No need to drain water
  • Material is drawn to leaks and seals
  • Non-toxic, biodegradable, environmentally friendly
  • Will not harm livestock

If your pond / lake / reservoir has water in it & is currently leaking, now is the best time to apply. The flow toward the leak, draws the polymers into the problem areas to seal the leaks.

Do not under apply! 

Not recommended for application to water bodies less than 5,000 square feet in size.

Prepping for Application

Remove any deep silt, livestock, dense reeds or heavy vegetation, as they can impede the polymers ability to get to the seepage.

Soilfloc Pond Sealant Application

Simply sprinkle the polymer crystals of Part A and Part B over the water surface. The water should not be moving and you should not apply during rain or wind events. Distribute it as if you are “feeding chickens” at the recommended rates. Remember to cast out gently no more than 5’ by hand, scoop or fertilizer spreader from a boat or raft.

Apply minimum of:

4 oz. per 10 sq. ft. applied as follows

Soilfloc Sealant Part A 2 oz. per 10 sq. ft.

Soilfloc Sealant Part B  2 oz. per 10 sq. ft.

Apply Soilfloc Sealant Part A to approx. 10 sq. ft. section first followed immediately by Part B to the same 10 sq. ft. before moving to the next section.

What is Soilfloc® Sealant?

Soilfloc® Sealant is a polymer based, Earthen Pond Sealant.    Polymers make up many of the materials in living organisms, including proteins; they are natural or synthetic substances composed of very large molecules (macromolecules).  Soilfloc® Sealant is an Anionic Polyacrylamide polymer, also known as PAM.

What is PAM?

PAM is a synthetic (man-made), potassium or sodium based, long-chain polymer (same molecule repeating itself many times) designed to attract either positively charged particles or negatively charged particles.  Anionic polyacrylamide has no aquatic toxicity

How does Soilfloc® Sealant work?

Soilfloc® Sealant is a combination of synthetic, anionic PAM’s, that both flocculate and hydrate, to plug leaks and stop water loss. There is no need to empty your pond, Soilfloc® Sealant works best when it’s full. It’s designed to locate leaks by following water as it’s pulled into the cracks and crevices by the leak.

What is flocculate and hydrate?

Anionic polymer has molecules that carry negative charges. They attract positively charged suspended clay particles much like a magnet picks up metal.  The other unique aspect of the formulation is the anionic cross-linked, insoluble polyacrylamide, which absorbs and retains large amounts of a water (over 300X its weight). Together, this powerful combination is pulled into cracks and crevices by the draw of the leak, binding suspended and surface solids, and swelling to over 300X its weight, to plug the leaks and stop the flow of water.

What can I expect during application?

Soilfloc® Sealant is a highly effective solution to leaking ponds.  However, it must be applied properly to work.  Product application does require some patience as fine particles accumulate in the PAM over time. When properly applied it gives the pond soil matrix the ability to reduce leaks that normally would not be fixed without reconstruction or full geomembrane pond liners. 

Wear protective clothing and appropriate personal protective equipment!  Because Soilfloc swells significantly in the presence of water or other liquids we recommend that applicators wear eye protection, industrial grade respirator, and ear plugs while applying the product.  Our applicators generally wear a disposable, hooded tyvek suit as well.

The full effect of a polymer pond sealant treatment is usually not seen until at least 3 weeks after treatment.  


SOME Soilfloc® Sealant part B will float; this happens -it doesn’t mean there is anything wrong with your product!  This is especially true if you have a pond with large cracks and crevices and have custom ordered larger sized crystals to seal your leaks.  Because they take longer to swell, they may not sink before swelling. You may also see these polymer crystals at at the bottom of your pond for a while following application, they’ll eventually become part of the soil matrix.

Unsure about the best treatment to seal your leaking pond? Read More Here


How does ESS-13 compare?

ESS13, a Seepage Control product, is a commercially applied liquid sealant.  The ESS-13 liquid pond sealant requires approximately 1 gallon of ESS13 for every 2,000 gallons of pond water.  For a 1 acre pond with an average depth of 6 feet and a water volume of 1.9 million gallons, approximately 1,000 gallons of ESS-13 would be needed.  Just 15 units of Soilfloc would treat the same area.  ESS13 is generally applied by a contractor with a field representative of the Seepage Control company on site.  The 2-part polymer Soilfloc application is a straightforward DIY project that can be completed in a day. 


Soilfloc Pond Sealer Reviews - What our Customers are Saying

Worked great sealing my pond
Review by Gary M. on 5 Jun 2022 
Worked great sealing my small clay pond which had a slow leak. Tried sealing with bentonite several times without success. Applied Soilfloc according to directions on a very calm day. Haven't had any leakage since, workd almost immediately.
Easy to use Pond Sealer
Review by MEGAN A. on 6 Apr 2021
Easy to use and effective
Fast Delivery
Review by Garrett H. on 17 Sep 2021
I received my pond sealer the next afternoon, great service.  Will let you know how things go.
Yes indeed 
Review by Chris G. on 23 Aug 2022
Yes indeed - I had quite a significant leak in my half acre pond. I was losing approximately 400 gallons a day. We put the soil floc in and within 24 hours you could see a difference within a week it has all but stopped. I would estimate I am now only losing 20 gallons a day. The one thing I will add is this material is extremely slick. Like Scooby Doo slick Yes indeed so be careful
I was skeptical at first 
Review by Joe V. on 16 May 2022
I was skeptical at first after 5 1-ton bags of Bentonite did not seal our pond but after 3 weeks and 2 kits of soilfloc the pond seems to be holding. It was very slimy on a kayak spreading it out onto the middle but it was worth it.
Doing great!
Review by Marvin K. on 18 Apr 2022
I applied it as instructed and the rate of drop on my pond has slowed dramatically. Before it was dropping at a rate of about 4 inches per day. Now it is at about 1/4" per day. Thank you! I am hopeful this will be a lasting solution for me.
Jesse was super helpful, making sure our approach to using SoilFloc was appropriate given our site conditions. Not to mention the quality of the product. It works!
Works great 
Review by Shaun H. on 2 Nov 2021
SoilFloc works great!!! But it is very messy. Once wet it turns into a slime that doesn’t dissipate. It’s holds the water very well so it’s worth the mess. After applying it we put a thin layer of sand around the shoreline to prevent people and animals tracking the slime around.
Significantly slowed the pond leak
Review by Adam B. on 10 Sep 2021
Significantly slowed the leaking in my small pond. Cleared out the weeds in the pond in the hopes that one more treatment will slow seepage to a near stop.
Treated the leak area 
Review by David H. on 11 Aug 2021
I have treated the area thought to be where the suspected leak might be. I’d say l used about a 1/2 gallon of part A and B and spread it out like chicken food. I’m extremely pleased with the result of a single application. I’m going to do a second application go be on the safe side.
Pond leak is improving with Soilfloc
Review by William S. on 29 Jul 2021
Pond leak is improving I think!
Fifty Percent Improvement
Review by Charles K. on 20 Oct 2022
We applied 880 lbs of Soilfloc to a half-acre pond 14 days ago. The rate of loss has decreased from 1" per day to 1/2" per day. We're hoping it plugs the leaks completely in the next few weeks. I'll update this review then.
Pond sealer
Review by Michael C. on 6 Sep 2021
Very impressive product, very messy applying it but it works
Worked better than expected
Review by Alex on 7 Aug 2021
My pond is about 1/8th acre so pretty small, but after doing some around the edges (laying boulders), I must have disturbed something as it started draining out. After 24 hours, I lost a foot due to seepage and I never saw it that low in 3 years. I applied a liberal amount of SoilFloc and now 3 days later, with zero rain, the pond hasn't dropped more than an inch. Honestly amazed at how well it worked and how quickly it worked. Definitely would recommend.
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