How long should it take to clear black algae

If you are just wanting to raise your pH, "Washing Soda" would be a better choice. But, you can use baking soda.

I don't know if you saw the full question, I bought A&H Super Washing Soda, is this the same as Borax? I want to use it to raise my PH.

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Originally Posted by joecus

I don't know if you saw the full question, I bought A&H Super Washing Soda, is this the same as Borax? I want to use it to raise my PH.

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No it's not. Washing Soda raises the TA significantly more than Borax will for the same PH increase.

Quote:

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Originally Posted by joecus

I don't know if you saw the full question

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Sorry;
washing soda = sodium carbonate (strong effect on pH; moderate effect on carbonate alkalinity)
baking soda = sodium bicarbonate (moderate effect on pH; strong effect on carbonate alkalinity)
borax = sodium tetraborate (strong effect on pH, no effect on carbonate alkalinity; some effect on total alkalinity)

Borax is inhibits algae; carbonate alkalinity encourages it.

thanks everyone.