Rated 3.7 out of 5 by 3
Rated 5 out of 5 by zeusvh Difficult to find, but not to worry
Yes, these "P" cartridges for the small Marineland filters are hard to find. Only Petsmart has them and only limited stock. But you don't really need them. Go the DIY route and get cut-to-fit filter floss and a very small bag of bio-stones. (Fluval makes one) all available at Petsmart. Cut several layers of the foam to fit the bottom of the filter then place the bio-bag on top. That's it. It will last for years with simple washing from time to time.
September 23, 2016
Rated 5 out of 5 by George13 Good but hard to find
My tank uses this filters, and while they are add to find, they work excellent.
March 5, 2016
Rated 1 out of 5 by B123222 I had to go to three different stores to find this filter, why have a tank require this filter if it isn't easy to obtain, and may be discontinued?
February 15, 2016