u/cluelessbasket

Just moved in and there is an RO system under the sink which I know nothing about. I’ll be replacing the filters and need to make sure I’m buying the right thing. What’s the best way to clean the system?

I forgot to take a picture of it but there is a cartridge that looks nearly identical to the 4th item from the link.

Also, I’ve read the membrane can last 3-5 years and the stage 1 and 2 filters 6-12 months. What exactly is the 4th item and how often does it need to be replaced?

https://affordablewater.us/products/microline-4-stage-ro-replacement-kit-three-filters-50-gpd-membrane

I know nothing about this stuff, thanks