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@Jon Parr - I see you point. I thought the issue was about concrete buffering the water and keeping it in an alkaline state.
@Jon Parr -The other day I wrote "I used a lot of concrete when I built my pond. It does not have any problem with pH" The pond is not something I test very often and the pH is of little concern to me since everything grows so well without my attention. So I thought I had better make sure I was not saying something that is not true.
So yesterday I tested the pond's pH. It read 8.2 pH which is about what our water tests at too. I then put 600ml of 14% HCl acid in. I measured it about 24 hours later and it had dropped to 7.8 pH. I then put another 300ml HCl in and measured it at 7.4 pH 6 hours later. Here are the results. The colors in these tubes have changed slightly over the past 32 hours but as you can see the water is not severely buffered by the concrete.
The bio filter is 7'x3'x3' inside dimensions and built of concrete block, which is sealed by ThoroSeal.
The water falls and first 18" around the edge are concrete and rock,
The pond contains about 1100 gallons of water and is about 9 years old.
Bob / Jon Parr, thank you for the feedback. The system is located within Sweetwater Aquaponics. So far this experiment is working great. The water chemistry is balanced out and is holding life. It even serves as a bee watering hole LOL. This photo was taken early July. I will post updated photos later. Have fun growing!!
@Jon Parr - I used a lot of concrete when I built my pond. It does not have any problem with pH
Claudio, I followed the link to Friendly's. Be wary of their advice. They have said many things contrary to common knowledge (worms causing e coli, and in the same breath as saying gator-ponics is safe, and more). I am indebted to their contributions to the industry, but not everything they say checks out, so be wary.
Bob, it is my understanding that concrete is always going to buffer pH up. As long as cement is present, then so is Calcium, similar to limestone or seashells in your media. True, is will lessen, but never quit buffering up. Perhaps this is desirable if using very soft water or rainwater, but not hard water like I have.
@Kntryhart - This is a good information from Claudio B. Maxwell-Merrill
I would also suggest letting the system settle in before adding fish. Balancing pH is tricky and until it settles in you will continue to get some wild pH swings. This goes for media too. Be sure to add your media and let it settle in too. This can all be done while building bacteria (cycling).
Hello, If the intended use is for aquaponics; Yes, It could be made PH neutral see link below as an example
This is from the aquaponics news letter
@Kntryhart - Concrete only affects the pH for a short time. After the buffers are gone pH will be fine
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