Product review (4 stars): Quick 6 mo change filter - just plug 1/4" tubes in
there are so many filter hookups that it can be unreal trying to find "yours".  This filter is used on my RO system as a final filter before going to the tap for taste after all the nasties have been taken out of the water.

Your filter change interval should be 6 months. why?  I have a photo of the 3 pre-filters that take out MOST of the nasties before the water hits the RO membrane - their job is to protect the membrane against big stuff hitting it and the final filter before water goes off to the RO surface area is a 1 micron spun filter (no carbon - no taste - just keeps particulate from going into the RO membrane)

The RO system is all connected with 1/4" tubing - from the output of this filter it goes to the tap (and along the way there is a T fitting in the tubing to monitor the water quality) - that gives me a numerical number as to how clean the water is.  It can go as low as 4 ppm TDS (total disolved solids) - it comes from the city at 260 ppm TDS so the RO system is doing its job.  Mine also has a UV-C lamp (germacidal) to kill anything that makes it through so the final water is sterile as well.

The only other filter that could be added to this system is a mixed bed DI (de-Ionization) filter which takes out any stray ions and traps them chemically but it would only take the 4ppm down to 0 ppm.  It's also not good to drink 0 ppm water because it is so devoid of minerals that the water will pull minerals out of your body as it goes through the kidneys and divert those that were headed for cells to the uninary output.

between 4-10 ppm is a good range to shoot for in TDS for drinking water - MUCH better than the 250-500 that the city water can give you

6 months is an ideal filter change interval - reason is because even thought the filter is not clogged, stuff can grow on the filter media - bacterium that come in with the water and are less than the epa guidelines for drinkable water have a nice place to sit and multiply.  I took a photo of the  3 prefilters on my 6 mo change and they were pretty darn green (started off nice and white) by the 6 mo change time.

So even if it flows fine and tastes fine - use time as a measure of filter change.

ps - the tubes will just push in and be a royal pain to pull out - the trick is to pull up on the pincher around the tube first to release the compression, then remove the tube, push the pincher back in on the new filter and push the tube straight in - ensure it is not deformed - if so it will leak and not make a good seal.  Cut off 1/2" if that is the case at the end to make a straight cut and a round 1/4 " tube.