Blanket weed appears from spores, it can be controlled by limiting light ,eg lots of lillies to cover surface. Or Canberra helped by using barley straw.if you want more surface area exposed an electric blanket weed controller which uses radio pulses through an aerial wrapped round the filter inlet pipe is just the job,it doesn't stop weed growth but makes it brittle so it breaks off and can be dealt with by the filter. I've had one about 5 years and no longer have great tangles of green, it takes about 4 weeks to become effective , but I reckon great value at 30 quid
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