X18-PHY25 Serenity Filter

Replacement for Hydropool Pleatco X18-PHY25 filters used in the Serenity series hot tubs in 2020. 2 of these filters were used to replace the large Serenity Wave Filter P/N 4520035. Your hot tub model may require the sleeve adaptors Hydropool P/N 5005045 for these filters to fit, sold separately at most Hydropool spas dealers.