Quick take
Waterdrop currently lists G3P800-N2RO for up to 24 months or 2,200 gallons, at $139.99 one-time.
Correct fit
Waterdrop identifies G3P800-N2RO specifically for the G3P800 800 GPD system.
Published service life
The current manufacturer rating is up to 24 months or 2,200 gallons, depending on feed-water conditions.
Current price
Waterdrop currently lists the replacement membrane at $139.99 one-time.
When replacement becomes urgent
A persistent loss of rejection performance after flushing and replacing upstream filters is a stronger membrane-replacement signal than age alone.