BLUEFLO Spa Filter Cartridge Replacement for Unicel 6CH-940, Filbur FC-0359, PWW50P3(1 1/2" Coarse Thread), 817-0050, Darlly 60401, for Viking Spa Hot Tub Filter, 2 Pack

Consider the BLUEFLO Filter Cartridge to among your top go-to pool, hot tub, and spa cleaner essentials if you have 1 of those compatible models. However, be sure to replace your cartridge regularly to ensure the long-lasting life of your pool's filtration system. Here are some signs it may be time to replace your cartridge: The plastic end caps on your pool cartridge ensure the material stays together. They're made of heavy-duty plastic but can crack over time with exposure to pool chemicals. When they become brittle, they can crack or chip, sending broken pieces through your filtration system and causing equipment damage. Prevent any possible harm to your pool's filtering system by replacing your cartridge as soon as you notice damage on the plastic endcaps. When the pleats of your cartridge become flattened or damaged, water flow through the filter can be restricted and reduce its ability to efficiently clean your pool's water. This happens through normal use as dirt and other debris saturate the cartridge. Additionally, if you find your band is broken or missing, it's time to replace your cartridge. Water pressure, chemicals, and day to day use can cause cartridges to wear over time. You may notice this in the form of ripped fabric or fraying, causing it to look like there are small "hairs" on the cartridge. If you notice ripping or tearing, replace your filter early, as these tears will only widen over time. A crushed cartridge is a sure sign it's time for a replacement. While it's reinforced inside to back the pleats, a cracked end cap or inner core, cartridges that are too small for your filtration system, or those that are of sub-par quality can cause it to collapse completely