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Old 26-09-2017, 10:38 PM   #29
ymmij
Senior Dragon
 
Join Date: Apr 2005
Posts: 3,332
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I did not really bother about dosage. Just add until you see the water turns to light purple or even dark purple, as with your preference as you do not have fish in the tank.

PP will kill ALL bacteria, including the good ones.
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