First post...cement pond paint?

[Tesla_HV]

Hello everyone. I am new here and this is my first post. I live in northern Massachusetts and have an outdoor pond that we inherited when we bought the house. It was built using concrete/cement sides and floor. It holds about 200 gallons and features a fountain piped underground to a pump and motor inside the house in the basement. I've installed a two-stage foam filter box on the inlet line to the pump. I started populating the pond with feeder comets back in April and now I think that I've worked out most of the issues that have killed my fish. I now have graduated to a few kois that my children have named "Ned", "Ted", and "Red". I bought both hardy lilies and water hyacinth that are growing prodigiously. I still occasionally have to fight ph balance issues that I think I can attribute to lime in the concrete walls and floor. I think that a good coat of paint might seal the pond but I am afraid of using the wrong type. Does anyone have any suggestions on the type of paint to use? Also, how long do you think that I would need to let it "cure" before refilling and returning the fish?
Thanks,
Monty

 

[Toirtis]

There is now available a roll-on black liner coat for concrete ponds that is supposed to be fantastic...I cannot remember the brand just now, but will look it up later today, if you wish.

 

[*TJ]

Monty, the product Toirtis is referring to is Herco liquid rubber.

You can use pool paint, ask the sales person for one that clearly states "FISH SAFE" on the label. Should get about 2 to 3 years before reapplication. You should prepare the concrete surface, and a primer may be needed.

If you're at all handy, you can use a 2 part apoxy to seal the water feature. No worries, after it's cured it's inert... harmless.