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commented on "Filter foam 5x100x100cm - 10ppi"
on www.maximumaquariumsupplies.co.nz
http://www.maximumaquariumsupplies.co.nz/gallery/Filter%2BMedia/filter-foam-5x100x100cm-10ppi/386034
ppi refers to pores per inch so for example 30ppi is very dense.
This foam is excellent for use in external & internal filters, simply trim it to fit. It can also be used to divide off areas in a tank for example instead of having 5 small tanks you can divide a big one so it has 5 areas.
Item added 22 November 2014
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