{"product_id":"master-spas-r4-15-mpt-two-pww50p3-filter-set","title":"MasterSpas R4 (1.5\" MPT) \u0026 Two PWW50P3 Filter Set","description":"\u003cp\u003e\u003c!--StartFragment --\u003e\u003c\/p\u003e\r\n\u003cp\u003eThis filter set is the \u003cstrong\u003eexact replacement\u003c\/strong\u003e required for specific \u003cem\u003eMaster Spas Trainer Series\u003c\/em\u003e, \u003cem\u003eChallenger Series\u003c\/em\u003e, and \u003cem\u003eMichael Phelps Swim Spas\u003c\/em\u003e. The R4 cartridge, built with a \u003cstrong\u003e1.5‑inch male pipe thread connector\u003c\/strong\u003e, is designed to house the EcoPur® Charge Mineral Cartridge inside. The two PWW50P3 cartridges install alongside the R4 to complete the filtration system, ensuring the water clarity and purification balance your swim spa was engineered for.\u003c\/p\u003e\r\n\u003cp\u003eIncludes:\u003c\/p\u003e\r\n\u003cul\u003e\r\n\u003cli\u003e\r\n\u003cstrong\u003e1 × Master Clear MA‑R4 Filter (1.5\" MPT)\u003c\/strong\u003e – Primary cartridge designed to capture dirt, debris, and particles.\u003c\/li\u003e\r\n\u003cli\u003e\r\n\u003cstrong\u003e1 × EcoPur® Charge Mineral Cartridge\u003c\/strong\u003e – Fits inside the R4 for mineral purification.\u003c\/li\u003e\r\n\u003cli\u003e\r\n\u003cstrong\u003e2 × Master Clear PWW50P3 Filters\u003c\/strong\u003e – Cartridges that work with the R4 to deliver full system performance.\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\u003cp\u003eImportant Fit Notes:\u003c\/p\u003e\r\n\u003cul\u003e\r\n\u003cli\u003e✅ Fits \u003cstrong\u003e2025 Trainer 12\u003c\/strong\u003e\r\n\u003c\/li\u003e\r\n\u003cli\u003e✅ Fits \u003cstrong\u003eall years MP Swim Force and Force D (except 2017)\u003c\/strong\u003e\r\n\u003c\/li\u003e\r\n\u003cli\u003e✅ Fits \u003cstrong\u003eall years MP Signature D\u003c\/strong\u003e\r\n\u003c\/li\u003e\r\n\u003cli\u003e✅ Fits \u003cstrong\u003e2024 and older Challenger 15 D\u003c\/strong\u003e\r\n\u003c\/li\u003e\r\n\u003cli\u003e✅ Fits \u003cstrong\u003e2024 and older Trainer 15 and Trainer 15 D\u003c\/strong\u003e\r\n\u003c\/li\u003e\r\n\u003cli\u003e✅ Fits \u003cstrong\u003eall years Challenger 18 D and 18 D Pro\u003c\/strong\u003e\r\n\u003c\/li\u003e\r\n\u003cli\u003e✅ Fits \u003cstrong\u003e2015 and newer Trainer 18\u003c\/strong\u003e\r\n\u003c\/li\u003e\r\n\u003cli\u003e✅ Fits \u003cstrong\u003eall Trainer 18 D\u003c\/strong\u003e\r\n\u003c\/li\u003e\r\n\u003cli\u003e✅ Fits \u003cstrong\u003eall MP Swim Signature D\u003c\/strong\u003e\r\n\u003c\/li\u003e\r\n\u003cli\u003e✅ Fits \u003cstrong\u003eall MP Swim Signature (except 2017)\u003c\/strong\u003e\r\n\u003c\/li\u003e\r\n\u003cli\u003e✅ Fits \u003cstrong\u003eall MP Swim Signature S\u003c\/strong\u003e\r\n\u003c\/li\u003e\r\n\u003cli\u003e❌ Not compatible with newer 2025+ models using the \u003cstrong\u003eR4 (2\" FPT) bundle\u003c\/strong\u003e\r\n\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\u003cp\u003e🗓️ \u003cstrong\u003eReplacement Schedule\u003c\/strong\u003e\u003c\/p\u003e\r\n\u003cul\u003e\r\n\u003cli\u003eFilters: Replace every \u003cstrong\u003e12 months\u003c\/strong\u003e with regular care, or every \u003cstrong\u003e6 months\u003c\/strong\u003e with heavier use\u003c\/li\u003e\r\n\u003cli\u003eEcoPur® cartridge (inside the R4): Replace every \u003cstrong\u003e6 months\u003c\/strong\u003e\r\n\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\u003cp\u003e \u003c\/p\u003e\r\n\u003cp\u003ePlease verify your swim spa’s model and production year before purchase. Due to the nature of the product, we cannot accept returns on opened or incorrectly ordered filter sets.\u003c\/p\u003e\r\n\u003cp\u003e\u003c!--EndFragment --\u003e\u003c\/p\u003e","brand":"Master Spas","offers":[{"title":"Default Title","offer_id":45344534724745,"sku":null,"price":259.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0752\/6491\/7641\/files\/2_PWW50P3_1_PMA-R4_1_PMA-EPR_Filter_Set.jpg?v=1780684682","url":"https:\/\/shop.masterspaswest.com\/products\/master-spas-r4-15-mpt-two-pww50p3-filter-set","provider":"MasterSpas West","version":"1.0","type":"link"}