The Watts Premier 105331 RO PURE 50 GPD Membrane is a residential reverse osmosis membrane designed exclusively for the RO-PURE and WP-RO4 systems, delivering up to 50 gallons per day of purified water. This semi-permeable membrane removes up to 99% of dissolved solids, heavy metals, and cysts through advanced TFC (thin-film composite) filtration technology.
SPECIFICATIONS
Core Performance Data
Daily Capacity
50 GPD
Gallons per day at standard conditions
Membrane Type
TFC RO
Thin-film composite reverse osmosis
Service Life
2–5 Years
Varies by water quality and usage
Contaminant Rejection
Up to 99%
TDS, heavy metals, cysts
System Compatibility
RO-PURE
WP-RO4 systems only
Part Number
105331
Watts Premier OEM membrane
TECHNICAL DETAILS
Membrane Specifications
| Manufacturer | Watts Premier |
| Model Number | 105331 |
| Production Rate | 50 gallons per day (GPD) |
| Membrane Technology | Thin-film composite (TFC) semi-permeable |
| Contaminants Reduced | Arsenic, lead, nitrates, perchlorate, chromium, copper, TDS, Giardia, Cryptosporidium |
| Recommended Replacement | Every 2–5 years based on water conditions |
| Installation | Easy drop-in replacement, no special tools required |
COMPATIBILITY & APPLICATIONS
System Fitment
The Watts Premier 105331 membrane is engineered specifically for the RO-PURE and WP-RO4 reverse osmosis systems. This membrane will not fit Watts 1/4 Turn KWIK Change filter housings or other manufacturer systems. It is designed for residential point-of-use applications where municipal or well water requires reduction of dissolved solids, heavy metals like lead and arsenic, and microbiological cysts. Ideal for under-sink installations in homes, small offices, and light commercial settings where daily water consumption does not exceed 50 gallons.
💧 Membrane life is directly tied to pre-filter maintenance. Replace your sediment and carbon pre-filters on schedule to protect the RO membrane from fouling and maximize its 2–5 year lifespan. Neglecting upstream filters is the most common cause of premature membrane failure.
