Tom.B
Moderator Emeritus
- Joined
- Jul 30, 2009
- Messages
- 5,839
- Location
- USA
- Vessel Name
- Skinny Dippin'
- Vessel Make
- Navigator 4200 Classic
We (I) am looking at adding a water filter to our fresh water system. Looking at most of the inexpensive filter housings, they all are listed as just one or two gallons-per-minute while my pump is rated at 4.2 gpm. A filter with a gpm rating as high as the pump is a great deal more expensive ($125 versus about $30) and is quite a bit larger.
While the price and size aren’t deal-breakers, our last boat did have a cheap Whirlpool filter (two actually... one for sediment that looked like a spool of string... and the other a charcoal cartridge... and both available off-the-shelf at Lowe’s). I never noted whether it was a restriction point on the old boat or not, but I do know the math was about the same; a 1 gph filter and a 3.3 gph pump.
Would a 1 or 2 gph filter really be a restriction to (or on) a system with a 4+ gph pump?
While the price and size aren’t deal-breakers, our last boat did have a cheap Whirlpool filter (two actually... one for sediment that looked like a spool of string... and the other a charcoal cartridge... and both available off-the-shelf at Lowe’s). I never noted whether it was a restriction point on the old boat or not, but I do know the math was about the same; a 1 gph filter and a 3.3 gph pump.
Would a 1 or 2 gph filter really be a restriction to (or on) a system with a 4+ gph pump?