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concrete and alkalinity
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Posted by deesee uk n (My Page) on Wed, Mar 30, 05 at 5:59
| I have just read that concrete that comes into contact with the water increases the alkalinity of the water drastically, i am about to increase the size of my pond and was going to use quite a number of concrete slabs. My main worry is algae, i have trouble with it now and i would not want to make it worse, have any of you any ideas on the subject, i know i have trouble with rain water flowing into the pond after heavy rains but hope to sort that out when i extend my pond. |
Follow-Up Postings:
RE: concrete and alkalinity
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- Posted by AJC_1 8 the fens (My Page) on
Wed, Mar 30, 05 at 7:27
| It does increase alkalinity, it also adds lime into the pond,tho it may take a while, concrete should be sealed with G4 or any other pond sealent paint. |
RE: concrete and alkalinity
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If you use G4 pond sealant as I did for the slabs round my pond, remember that cement has to cure for a certain amount of time before you apply it. It is also much easier to apply before filling the pond- I kept getting drips in the water which I had to soak up with newspaper.
Initially I didn't use the sealant, but when I found poor little baby frog corpses stuck to them (they had dehydrated with the concrete) I had to sea them.
You can easily test the pond water to see if you have an alkalinity problem. Remember to test your water now before you start work to find out what the "natural" pH is. |
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