need find cheap (or free) good filter medium for my 436 Gallon filter
Matt Helliwell writes:
Or instead of window screening, you can use green house shading.
Probably the same stuff but, in the UK at least, seems easier to obtain.
You can also get a variety of mesh sizes.
Me, I swear by bird netting. Never clogs, slows down the water so that
particulates drop out.
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