Gypsum
Was $1.99
SAVE 25%
$1.49
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Gypsum (Calcium Sulphate, use 1tsp per 5 gallons) Gypsum is used to add hardness back into the water if you have soft water, use RO, or use Distilled water. Also used to lower the PH.
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$1.99
$1.49
(-$0.50)