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Bio-filters and lava rock
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? -Pat Rolland |
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