{"product_id":"master-clear®-two-ma-r4-four-ma40-filter-set-2-fpt","title":"Master Clear® Two MA-R4 \u0026 Four MA40 Filter Set - 2\" FPT","description":"\u003cp dir=\"ltr\"\u003eThis filter set contains everything needed to replace all six filters in MasterSpas 21-foot swim spas. These models feature two separate filtration zones -- a swim spa zone requiring one MA-R4 and three MA40 filters, and a hot tub zone requiring one MA-R4 and one MA40. Buying them together ensures your entire filtration system is replaced on the same schedule, keeping your water clean and your spa running at peak performance.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eEach MA-R4 is designed to accept one EcoPur® Charge Mineral Cartridge inside its filter core, combining mechanical filtration with mineral purification across both zones. EcoPur® cartridges are sold separately.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eCompatible Models — Current Generation (2025+)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cem\u003eH2X Swim Spas:\u003c\/em\u003e Trainer 21D, Trainer 19D Max (2026+), Challenger 21D\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eImportant Note for Pre-2025 Spas\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eMost MasterSpas swim spas manufactured before 2025 used a female port that accepted a male-threaded filter. Beginning in 2025, that relationship flipped. All filters in this set have a female thread designed for the new male port configuration. If your spa was manufactured before 2025, you may need a thread adapter for compatibility. If you know you need one, it is available for purchase separately on our site. If you are unsure, contact us before ordering and we will confirm the right fit for your specific model and year.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eReplacement Schedule\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eReplace all filters every 12 months under normal use, or every 6 months with heavier use. If you use the EcoPur® Charge Cartridges, replace each one every 6 months.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cem\u003eDue to the nature of filtration products, we cannot accept returns on opened or incorrectly ordered items. Please verify your model and production year before purchasing.\u003c\/em\u003e\u003c\/p\u003e","brand":"MasterSpas West","offers":[{"title":"Default Title","offer_id":48439941890185,"sku":null,"price":522.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0752\/6491\/7641\/files\/IMG_2351.webp?v=1772582795","url":"https:\/\/shop.masterspaswest.com\/products\/master-clear%c2%ae-two-ma-r4-four-ma40-filter-set-2-fpt","provider":"MasterSpas West","version":"1.0","type":"link"}