PLF6CH-940 Hot Tub Filter compatible for Unicel 6CH-940, for Filbur FC-0359, for Pleatco PWW50, for Filbur FC-0359, for Waterways 817-0050. Please check your model for 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.new and high quality Filters.For PWW50 hot tub & Spa Filter.Compatible models:For Unicel 6CH-940For Pleatco PWW50For Filbur FC-0359For Waterways 817-0050Colour:Blue & WhiteMaterial:PPPackage Contents:1 * hot tub filters replacement accessoriesOnly 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.