Your pool pressure gauge keeps rising, your water looks a little cloudy, and you’re not sure if the filter housing is the problem or just the cartridge inside it. If you own a Hayward pool system, this confusion is very common, and it can cost you money in wrong parts and wasted time.

A Hayward cartridge filter is a pool filtration system that uses pleated cartridge elements instead of sand or DE powder to trap dirt and debris. Hayward’s SwimClear and Star Clear filters use strong pleated polyester cartridges with a media area of 56 square feet, made from a durable pleated material with molded end caps. 

Choosing the right size and following a simple care routine makes the biggest difference in how clear your water stays.

Why Are Cartridge Filters Becoming So Popular?

More pool owners are switching from sand filters to cartridge filters every year. Cartridge filters now hold about 38 percent of the market and are growing quickly as more people care about saving water and space. In fact, the global market for these filters was worth close to 2.87 billion dollars in 2025 and is expected to grow to about 4.52 billion dollars by 2033.

In my experience, people switch for one simple reason. Cartridge filters take up much less space than sand systems and need less frequent cleaning, often needing a full cartridge replacement only once every one to two years.

How Do You Know Which Hayward Cartridge You Need?

The mistake I see most often is people guessing the size instead of checking it. Here is what actually works:

• Match the cartridge’s square footage to what your filter housing is rated for
• If you are unsure, choosing a slightly larger size is safe, but never pick a smaller one
• Check if your filter uses more than one cartridge, since some Hayward models use four cartridges in one housing and all four should be replaced together, even if only one looks dirty

What Happens If You Mix Old and New Cartridges?

Do not do this. Mixing old and new cartridges causes uneven water flow and shortens the life of every cartridge in the system. I have seen this simple mistake ruin a brand new cartridge within just a few months.

Is a Cartridge Filter Better Than a Sand Filter?

It depends on what matters most to you. Cartridge filters clean water more finely and use less water overall, but sand filters usually cost less upfront. One real example shows why sizing matters so much. 

A pool owner using a Hayward filter noticed the pressure kept rising fast even after cleaning, and Hayward’s support team explained that the filter was simply too small for the amount of water flowing through it.

Final Thoughts

A Hayward cartridge filter can give you some of the clearest pool water possible, but only if it is sized correctly and cleaned on a regular schedule. Check your model number, choose the right cartridge size, and never mix old cartridges with new ones.

If your pressure keeps rising no matter how often you clean it, do not guess what’s wrong. Talk to a trusted pool professional, confirm the correct filter size for your pool, and get your system working the way it should.