Thread: Bio-filters and lava rock
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Old 30-05-2003, 05:08 PM
Andrew Burgess
 
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Default Bio-filters and lava rock
(O3raledale) writes:

hello all, I'm new here and new to pond building. I'm building a bio-filter and
need to fill it with lava rock. I went to the pond store today and they want
$40.00 a bag for small lava rock. Could I just use new BBQ grill lava rock? It
would be alot cheaper and isn't all lava rock the same?

Lava rock has a bad area to volume ration and a bad area to weight ratio.
Better to use something plastic...

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