Greetings all, I have a 2200 gal backyard pond with about 20 2-3 inch comets and koi and about 1/5 plant cover. This week my pH is at 6.5 How can i get it up to a good range. Can anyone recommend a good amount of baking soda or lawn lime dust to put in the pond to fix it. Could the pH have gone down due to a berry tree dropping berries in it all month?
Thanks to all, joe
We collect rainwater for our pond and aquariums in the house. I think you may have too many fish in that pond. Comets get to be about 12 inches long, and koi get huge...up to 10 or more pounds.
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Did you check the ammonia and KH? If you suspect a change from decaying matter ammonia may be present. KH stabilizes the pH and if it drops below 100ppm you may have wild swings where the pH reading can become meaningless.
Baking soda 1/3 pound per 1000 gallons. That will raise KH by 20 ppm. or about 1 degree. Baking soda is a great temporary fix.
I use about 2 cups of ground limestone (garden/lawn lime) in a sock, placed in the filter flow, to stabilize the pH at around 7.8. When the pH drops below that level the limestone begins to dissolve until the pH reaches about 7.8.
Regards,
Hal
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