Options for stopping it? Had a look around and seen:
bleach? 221 drops of thin bleach per icb?
copper sulphate? only one part per million, so one gram per 1000l ?
water purification tablets?
Barley straw?
Anything else?
bleach? 221 drops of thin bleach per icb?
copper sulphate? only one part per million, so one gram per 1000l ?
water purification tablets?
Barley straw?
Anything else?
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