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under-gravel filter

To: "plants" <aquatic-plants at actwin_com>
Subject: under-gravel filter
From: "Alexander Yohannes Suhendra" <tiger at personal_telkom.net.id>
Date: Thu, 29 Jul 1999 20:55:59 +0700

is using  under-gravel filter  promote plant growth ?
can  someone  explain  the  advantage/disadvantage in using  under-gravel
filter
thanks

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