Supa Anti-Algae Pond Block - Garden Pond Dirty Green Water Clear Treatment Koi. Condition is New. Dispatched with Royal Mail 2nd Class Large Letter. Supa Anti-Algae Blocks. When placed into the pond this block slowly dissolves releasing di-methyl urea into the pond waters. Whilst totally harmless to fish and healthy pond plants this inhibits the growth of water born algae. Prevention is always better than cure so the introduction of this item in early Spring will prevent build up of algae as the weather warms. Each order contains 2 pond blocks
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