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These blanket weed treatment sachets are easy to use and are non-chemical so won’t affect wildlife Each sachet treats up to 1,000 gallons (4546 litres) of pond water - simply drop the sachet into your pond once a week The pond blanket weed control contains beneficial pond bacteria which are ideal for use in koi ponds No need to measure so there is no chance of over dosing your pond whilst ensuring you get less sludge and odours 6x 28g sachets of blanket weed remover per pack