I'm sorry this wasn't answered. Somehow, it ended up in the wrong section and was overlooked.

The Intex cartridges are not very high quality and do not last long. As explained below, a pair of Unicel-brand cartridges should resolve the problem. You have to be careful: many Asian made, and inferior quality, cartridges are sold very deceptively, and not all pool dealers know the difference. If you want to replace your filter cartridge, there are 3 -- and ONLY 3 -- good options: OEM cartridges (for American made filters); Unicel brand cartridges, and Filbur brand cartridges. Be very wary of online sellers who blur the line between "fits the same filters as a Unicel" and "is a Unicel".

Ben

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+ The OEM cartridges in Intex / Summer Escapes / etc. filters are not high quality. The Intex manuals recommend replacing them completely every 2 weeks. A BETTER option is to replace them permanently with 2 - 3 Unicel cartridges, and rotating them through a cleaning solution. Properly maintained, the Unicel cartridges will last all season AND will filter better. So even though they cost more per cartridge, they cost less per season! Learn to maintain them, by reading this post, Cleaning-your-Cartridge-Filter-wiithout-Damaging-It!

But, purchasing them is tricky. Amazon does not consistently stock them, and some of the 3rd party sellers are charging high prices and/or high shipping. So, check the Amazon link, but watch out for the prices and shipping costs.

It would be nice if you could just buy them elsewhere, but many of the online pool stores are listing Pleatco or other Asian made low quality filters, as "Unicel C-4607 type" or "fits Unicel C-4607". So shop carefully!

Here are the Amazon links:
Unicel C-4607 Replacement Filter Cartridge (Easy Set Size A or C) @ Amazon
Unicel C-5315 Replacement Filter Cartridge for 15 Square Foot Intex B Filter @ Amazon