Description
This filter set is the exact replacement required for select MasterSpas Trainer Series and Challenger Series swim spas manufactured in 2025. The R4 cartridge, built with a 2‑inch female pipe thread connector, is designed to house the EcoPur® Charge Mineral Cartridge inside. The three MA40 cartridges install alongside the R4 to complete the filtration system, delivering the full water clarity and purification balance your swim spa was engineered for.
Includes:
- 1 × Master Clear MA‑R4 Filter (2" FPT) – Primary cartridge designed to capture dirt, debris, and particles.
- 1 × EcoPur® Charge Mineral Cartridge – Fits inside the R4 for mineral purification.
- 3 × Master Clear MA‑40 Filters – Cartridges that work with the R4 to deliver full system performance.
Important Fit Notes:
- ✅ Fits 2025 Trainer 15
- ✅ Fits 2025 Trainer 15 D
- ✅ Fits 2025 Challenger 15 D
- ❌ Not compatible with other Trainer or Challenger models outside these specifications
- ❌ Not compatible with swim spas using the R4 (1.5" MPT) bundles
🗓️ Replacement Schedule
- Filters: Replace every 12 months with regular care, or every 6 months with heavier use
- EcoPur® cartridge (inside the R4): Replace every 6 months
Please 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.
