Cartridge Filter, Pentair Rainbow RTL-50, Top Load, 1-1/2

Cartridge Filter, Pentair Rainbow RTL-50, Top Load, 1-1/2"s

Marsoni

M251S

$100.80

Get it in 3 business days with 1 day shipping. Friday, May 29

Cartridge Filter, Pentair Rainbow RTL-50, Top Load, 1-1/2"sRainbow Pentair RTL 50, model R172504 is a 1 1 2"s top load filter. For use on portable spas, it is designed to mount in a niche so that the main body is under the shell of the spa, while the top is accessed from above the spa. This complete filter includes a niche lock ring (secures the body to the niche), lid lock ring (secures the lid), push down lever (to secure and release the lid lock ring), 50 sq. ft. cartridge, and lid w o chemical feeder.

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So the quality of this not great, but good enough and they look nice enough on the wall. However, the bracket holes are not spaced at 16" intervals. WTF? I'm not sure who designed this thing. The molly plugs that came with it look OK, but to play it safe I used a cobalt steel drill bit and made my own holes in the bracket. Easy enough with some wd40. My other pick with this is that the screws to anchor the shelf to the bracket are black and and very obvious... they should have supplied some kind of cap.

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Reviewed in the United States on January 31, 2026