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commented on "Filter foam 5x33x33cm - 20ppi"
on www.maximumaquariumsupplies.co.nz
http://www.maximumaquariumsupplies.co.nz/gallery/Filter%2BMedia/filter-foam-5x33x33cm-20ppi/386039
20ppi
The measurements are around 5x33x33cm, some pieces are slightly bigger and some slightly smaller.
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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