Usage Tips:PLF6CH-940 Hot Tub Filter compatible for 6CH-940, for FC-0359, for PWW50, for FC-0359, for Waterways 817-0050. Please check your model for compatibility. The thickened advanced trilobal fabric, helps to contaminants, end caps are resistant to breakage, the enhanced center core make the entire filter have a longer service life. Using a 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 Filters. For PWW50 hot tub & Spa Filter. Compatible models: For 6CH-940 For PWW50 For FC-0359 For 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.