Description
The MA-R4 1.5" MPT (Male Pipe Thread) is the current-generation primary filter for a wide range of MasterSpas hot tubs and swim spas. Built with a 1.5-inch male pipe thread connection, it installs securely into your spa's filtration housing and is designed to accept the EcoPur® Charge Mineral Cartridge inside, delivering both mechanical filtration and mineral purification in a single unit. The EcoPur® cartridge is sold separately.
Unlike the 2" FPT version of the MA-R4, this filter uses a 1.5-inch male thread and does not require an adapter for pre-2025 spas.
Compatible Models - Current Generation (2025+)
Legacy Swim Spas: LW 12, LW 15
H2X Swim Spas: Challenger 19D
MP Swim Series: Force D, Momentum, Momentum D, Signature Pro, Signature D
Also Compatible with These Older Models
H2X Swim Spas: Challenger 15D, Challenger 18D, Challenger 18D Pro, Trainer 12, Trainer 14, Trainer 15, Trainer 15D, Trainer 17, Trainer 18, Trainer 18D, Trainer 19, Trainer 19D
MP Swim Series: Force, Impact, Momentum 50, Momentum 80, Momentum 80 D, Signature, Signature S
Replacement Schedule
Replace every 12 months under normal use, or every 6 months with heavier use. If you use the EcoPur® Charge Cartridge, replace it every 6 months.
Due 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.
