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Home » Brands » All Brands » Penn-Plax » Penn-Plax Ammonia-X Undergravel Filter Cartridge 2pk. #AX-2
Penn-Plax Ammonia-X Undergravel Filter Cartridge 2pk. #AX-2

Penn-Plax Ammonia-X Undergravel Filter Cartridge 2pk. #AX-2

Item #: 030172399510
Reg: $4.59
Sale: $3.80
You Save: $0.79 (17%)
Quantity: This item is currently out of stock!
  • Description
  • Reviews
Penn-Plax Ammonia-X Ammonia-Removing Undergravel Filter Cartridge is designed to fits Penn-Plax "Multi-Pore" and Undergravel "e" filters. Top quality zeolites eliminate the #1 fish killer - ammonia. Cuts down disease problems, solves over feeding, over crowding and foul water conditions. Contains 2 replacement cartridges.


  • Specifically designed to fit Penn-Plax "Multi-Pore", Undergravel “e” Filters, and Premium CFU Undergravel Filters
  • Easily slips into filter spouts with no need to disturb set-up
  • Cartridges should be replaced every 2-4 weeks
  • Keep your tank looking crystal clear
  • Quick, easy, disposable
  • For complete filtration, alternate with FC2 Carbon Filter Cartridges
Review Summary
4 Reviews
75% (3)
25% (1)
0% (0)
0% (0)
0% (0)
100% Recommend this product (4 of 4 responses)
By Plecky's D.
A Must Purchase For Ammonia Control!
February 4, 2022
We have a 14-year-old Plecostomus who has grown to 17 inches long, and anyone who has had this family of fish knows that they produce a good amount of ammonia to be offset... This product helps with the fight to keep readings under control :-) Charcoal is somewhat helpful in filters, but this gives you one more tool to keep your fish safe!
  • easy changing cartages :-)
  • might not be fully effective for length of time advertised :-(
By Daniel W.
Ammonia levels lower
August 20, 2018
Undergravel cartridge that works
By judith m.
Columbus, ohio
penn-plax ammonia-x undergravel filter cartridge 2pk. #AX-2
October 11, 2012
I really needed them and shall need more1
  • I need them for my tank
  • nothing
By Mary D.
Boone Iowa
These filters are hard to find in our area. Glad you sell them!
July 16, 2011
headline tells the story...
  • Fits our Undertow filter