Description
This filter set is the alternative replacement for MasterSpas Twilight Series and Michael Phelps Legend Series hot tubs manufactured in 2025 that are configured to run on saltwater systems. Instead of the standard R4 & MA40 combination with EcoPur®, this bundle uses two MA40 filters to deliver the required filtration capacity without EcoPur® mineral conditioning.
Includes:
- 2 × Master Clear MA‑40 Filters – Large‑capacity cartridges designed to capture dirt, debris, and particles for superior water clarity.
Important Fit Notes:
- ✅ Designed for 2025 Twilight Series and Michael Phelps Legend saltwater models.
- ❌ Does not accept EcoPur® Charge cartridge — mineral purification benefits are not included.
- 🔒 Genuine Master Spas replacement parts — required for proper operation.
🗓️ Replacement Schedule
- Filters: Replace every 12 months with regular care, or every 6 months with heavier use.
This bundle is ideal for spa owners running saltwater systems. Please verify your spa’s year, series, and water sanitation system type before purchase. Due to the nature of the product, we cannot accept returns on opened or incorrectly ordered filter sets.

