Pentair - 37 sq ft Rainbow (in-line)
	One Replacement Cartridge for Pentair - 37 sq ft Rainbow (in-line) Regular Price: $58.10 Sales Price: $36.89 You Save $21.21 or 36.50% Usually ships in 1-3 business days however many cartridges ship same day & may arrive sooner. Currently Out Of Stock with possible ETA May 2023

37 sq ft Rainbow (in-line) - Filter Cartridge Replacement for Pentair with Unicel - C-4637

Swimming Pool Filter Cartridge Replacement for Pentair 37 sq ft Rainbow (in-line) - .

Pool filter cartridges are used to filter swimming pool water by collecting dirt, debris, algae, oils and other contaminants and filtering them out of the pool water. Cartridge filters have a much larger filtering area due to their design and construction. The pleats on a cartridge allow the filter to run at a lower pressure. As a result, the back pressure on your pool and spa pump is reduced thereby increasing the lifespan of your equipment. A pleated cartridge can trap debris as small as 10 to 15 microns (not visible to the un-aided human eye).

Cartridge filtration has been increasingly popular due to lower maintenance in comparison to old style Sand and most D.E. pool filters. There is no need to "Backwash" a cartridge filter, losing water and chemicals. There is no diatomaceous earth (D.E. - white powder substance) to deal with and the cleaning of the filter cartridge is much simpler.

Please utilize the table below to cross reference numbers and measurements as well.

Description	Value
Unicel #	C-4637
Filber #	FC-2380
Pleatco #	PRB37IN
Filter Mfg	Pentair
Filter Model	37 sq ft Rainbow (in-line)
OEM #
Length	13-5/16"
Outside Diameter	4-15/16"
Inside Diameter Top	2-1/8" / open
Inside Diameter Bottom	2-1/8" / open
Pleat Count	158
Square Feet	37
Notes	37 sq.ft. C-4637 is an upgrade to 25 sq.ft. C-4326 and C-4625 cartridges.
Price	$36.89

How to Identify Your Pool or Spa's Filter Cartridge

How to Clean a Filter Cartridge

Types of Pool Filters