aquaponic systems operate within a pH range of 6.8 to 7.2, which is slightly acidic to neutral. This range is optimal for most plants and fish species that reside in the system. However, sometimes a specific plant or fish may have different pH preferences, which requires pH level adjustments to maintain suitable conditions…
copied from Why is pH Important in Aquaponics? - Go Green Aquaponics
if you want to keep your ph that high grow something that likes the ph that high.
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