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#1
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gunite pond
does anyone know if this would be harmful to fish?i've had such bad luck
with liners and i'm tired of fooling with it.since i can't build it myself using concrete,i'm thinking about having the swimming pool people blow in the gunite stuff. is it safe for fish?robin |
#2
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gunite pond
Gunnite is just a dry spray on type of concrete. Concrete has as one of the
byproducts of the hydration reaction that makes it strong, calcium hydroxide, saturated lime water. Calcium hydroxide has a high pH of about 12, which is too high for fish. The curing process for concrete is best accomplished with plenty of water, which will improve the impermeability of the concrete. Therefore, once the pond has been sprayed about a week, fill the pond with water and let stand for 3 or 4 weeks, then remove all water and allow to dry. This drying will allow carbon dioxide in the atmosphere to react with the calcium hydroxide to make calcium carbonate, or just plain limestone. Drying also allows the pores to get air inside, which inhibits the movement of the lime within the concrete. Refill the pond and monitor pH. If the pH starts to climb into the high 8's, then you can lower the pH by using muratic acid, used for cleaning swimming pools. Over time, the pH will stabilize, and the slow leaching of the concrete actually helps to maintain better water than the liner. -- RichToyBox http://www.geocities.com/richtoybox/pondintro.html wrote in message ... does anyone know if this would be harmful to fish?i've had such bad luck with liners and i'm tired of fooling with it.since i can't build it myself using concrete,i'm thinking about having the swimming pool people blow in the gunite stuff. is it safe for fish?robin |
#3
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gunite pond
I've had it done.
I had them put on a finish coat, which: 1) seals the cement, so there is no leaching of lime (they etch the concrete with muriatic acid, then apply the sealant) 2) you can pick you color of sealant. I had mine look like mud color (more natural appearing than black). It appears like mud brown when water is added, but out of the water actually looks off purple! Advantages: My pH and pK are rock solid. (no pun intended). The gunnite pond is guaranteed for as long as my I own the home. Leaks are a thing of the past. There are no liner folds to deal with. It is easy to vacuum the bottom. I had bottom drains installed, again with no risks of leaking. They even built in my skimmer box. Disadvantages: The cost. You can't modify the basic structure, though you can add concrete adjacent ponds. streams, etc, etc. Happy ponding, Greg -- wrote in message ... does anyone know if this would be harmful to fish?i've had such bad luck with liners and i'm tired of fooling with it.since i can't build it myself using concrete,i'm thinking about having the swimming pool people blow in the gunite stuff. is it safe for fish?robin |
#4
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gunite pond
I had a gunite pool and pond put in last summer.
The pond was sealed and filled with water for a couple of days drained and refilled. The fish have had no problems! |
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