How long should it take to clear black algae

[PoolDoc]

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

[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.

[SalemCastles]

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.

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

[PoolDoc]

I don't know if you saw the full question

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.

[joecus]

thanks everyone.