These Penn-Plax Ammonia-X Undergravel Filter Cartridges fit the Perfecto Perfect-A-Flow and Penn-Plax Undertow Undergravel Filters. For best results the Cartridge should be replaced every two to four weeks. 2-Pack (three 2-Packs). Top quality zeolite for eliminating the number one fish killer, ammonia. Cuts down disease problems. Solves overfeeding, over-crowding and foul water conditions.
K**N
One Star
It did not fit into the undergravel filter that I bought so was unable to use it
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