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Koi Pond: Dispelling Myths About Concrete

What do some liner promoters and salesmen say about professional pond installations using concrete and rebar, plus mortar to hold the rocks?

(1) “One problem with concrete and mortar construction is that of cement alkali leaching out for some time after construction, poisoning the pond water with high alkalinity. It also leaves unsightly white deposit build-ups at the points of exit and on the surface of rocks in the waterfall.”

NOT TRUE! If the concrete you use to pour the shell is a 7-sack mix with 40% pea gravel and stealth fiber mix, the concrete is so dense that no leaching can even occur. Also, because of the density of the concrete, it is not only waterproof, but stronger than normal 5-sack mix used to pour driveways, patios and sidewalks. Finally, if you coat the finished surface with Thoro-seal, one of several non toxic concrete sealers, it cannot leach.

(2) “When you use mortar mix to secure the rocks in a waterfall, the water that soaks into the porous mortar joints, leaches out alkali and phosphorescence that poisons the pond.

TRUE in the past, but not anymore. Regular mortar is porous, allowing water to pass through, dissolving and collecting the cement residue. This had been a major concern of mine for many years. After the completion of a waterfall, I would have to run the waterfall for two or three weeks, shutting it off every 4 or 5 days, and acid-clean the white alkali residue off the rocks that had built up. Then, when we were finished, we would have to acid clean and rinse out the pond.

Twelve years ago I discovered a secret formula that would render the mortar mix non porous and waterproof. It also makes regular mortar mix three times stronger. It is produced by adding one 45# bag of thinset (used to apply ceramic tile to a shower wall) to two bags of type S mortar mix. Once it cures, it becomes so dense, it is totally waterproof and will not leach any alkali after it cures (3 to 4 days). In addition, this mix is so strong in its holding ability that once it cures, a sledge hammer is needed to remove a rock. In most cases, the rock breaks up before coming free from the secret formula mortar.

It is not only waterproof, but it bonds very well with all types and textures of rocks. It will create a watertight barrier that comes in handy when building rock damns in the waterfall. The main feature of my special formula, is that it allows for much more creativity. You have the ability to raise the water level above the confines of the concrete shell without water leaking through the mortar joints, as in the case of regular type mortar mix.

This special mix is not for sale in the stores, and never will be, because I give the formula away for free! This discovery has revolutionized the effectiveness of mortar mix and its ability to bond, waterproof, and prevent alkali leaching.

A Dramatic Test

A 4,000 gallon swimming pool was converted into a concrete koi pond with two large waterfalls, held together with my new mortar mix, and an 8' x 12' island. The rocks surrounding the island, were also held by the new formula. When the project was completed, all the surfaces were given a quick, mild acid wash, and the pond was filled and dechlorinator was added. The following day, $3,000 worth of my own personal koi fish were transferred into the concrete koi pond. They all swam calmly around the island, inspecting every nook and cranny. None of them experienced any stress and they remained in their temporary quarters for three months with no incidents. If that dramatic demonstration was not enough to convert the skeptics, nothing will.

So what is the bottom line?

Pond liners cannot be guaranteed not to leak, for a myriad of reasons. Concrete and rebar ponds, if built properly, will stay leak-free for decades, if not generations. You be the judge. You’re the one investing your hard earned money and time into it.

Be as wise as an owl and as sharp as the many objects that can puncture a liner shell.

Look before you leap and research before you weep. Don't be pennywise and [pond] foolish. Happy koi, peace & joy.

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