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High pH from HTH pool filter sand

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13K views 22 replies 10 participants last post by  YamatoShrimp  
#6 · (Edited)
ddiomede said:
What else do you have in your tank? Rocks, decorations, etc.
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+1 for listing the other objects in the tank, especially rocks. Unless the bag is contaminated it should be pH neutral and inert.

Gorillastomp said:
Did you let sit your tap water for over 24h prior testing ? It could be that your tap water contains co2.
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He mentioned that his tap water tested neutral. I would think that CO2 would drop the pH not make it more alkaline(higher).
 
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