API PH Down Aquarium PH Adjuster, 1.25-Ounce

I have a 10 gallon tank. I have been having trouble getting the ph down. When I used this stuf on smaller amounts of water it dropped the ph pretty well. Still have not had luck putting it right into the tank but when I change out water I treat the water before putting it in and that seems to work. This product came quickly and I am glad I purchased it. Ik would recommend it to others

I found this product to work very well. I was surprised at how effectively a few drops worked. It was difficult at first to get the lid off the bottle, but once it was off the product was fine. You have to be careful not to squirt in too many drops in following the directions.

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it says to dose 2 drops per gallon in order to lower the pH but my water (dGH ~ 12; dKH ~ 6) needs 8 drops per gallon. I blew through this little 1.25 onces in just four water changes. I do recommend this product but maybe you will need a bigger bottle if you have hard water like me.

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Good product for a reasonable price, helps keep the pH down in my tank every now and then when I do water changes.

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This is nothing but 9% sulphuric acid solution. I have not checked what else is available but I would think you could buy sulphuric acid cheaper.

This stuff works and is very easy to use.