PLF6CH-940 Hot Tub Filter compatible Unicel 6CH-940, Filbur FC-0359, Pleatco PWW50, Filbur FC-0359, Waterways 817-0050. Please check your model compatibility. The thickened advanced trilobal fabric, helps to catch more contaminants, end caps are resistant to breakage, the enhanced center core make the entire filter cartridge have a longer service life. Using a spray nozzle to rinse the filter cloth until it changes to white color under regular cleanings. Please clean the filters every 1-2 months. Not universally compatible, please check the specific model. and high quality Filters. PWW50 hot tub & Spa Filter. Compatible models: Unicel 6CH-940 Pleatco PWW50 Filbur FC-0359 Waterways 817-0050 Colour:Blue & White Material:PP Package Contents: 1 * hot tub filters replacement accessories Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.