Hey all,

I have 1 more question... so I m trying to add RO system on top of my 1-stage water filter for drinking and i find it hard to get all the parts/fittings/etc that I want since I dont know what they call or the size. They will be located in the basement and the kitchen will be right above it. So here is my current situation

and this is what i want to achieve... I have purchased the RO system from amazon since Nov (https://www.amazon.ca/gp/product/B00...?ie=UTF8&psc=1)

Now.. i m not sure if I should use the existing 1-stage on top of the RO system since I thought I wouldnt have to change the RO system's filters that often if I replace that 1-stage water filter every couple of months since they are inexpensive. That open line meaning shut-off valve actually, I dont know the standard for plumbing diagram (sorry). And i was thinking that i would 1 shut-valves between the 1-stage and the RO. 1 more shut-off valve between the 1-stage and the line that goes to the faucet, or is there a 3-way shut off valve that does that?

Thank you guys so muchh!

 

So the fittings you will be using are called John Guest, very easy to find at most hardware stores.

As far as the current in line filter, the system you show is 6 stage, those filters are cheap and so do you really need another one, 7 stage, probably not but I doubt it's going to hurt anything to have it other than water pressure might be lower, especially when they all start getting dirty.

Yes, you definitely want a shut off valve leading to the RO unit.

 

In an RO system the first couple cartridges are for sediment. They can be replaced independently of the more expensive membrane. In my house I have a whole house sediment filter then there is the RO system so even though my sediment filter isn't right in front of the RO system in essence I have sediment pre-filter. I also have an electric pressure booster pump on my RO system to maintain system pressure.

 

Marq1 gotcha on the 1-stage filter being useless.. but for that John Guest, it seems to be a brand instead of the parts?

Pilot Dane yeah, i believe i purchased one with a boosted pump so i have to connect power to it.


as for the parts, i guess i will need some elbows, 2-way shut-off valves and that's it?
Is there such thing a PEX-to-Copper female fittings?

 

John Guest fittings are also generically called PEX Push-Fit fittings. Though when you search for those, you're more likely to find SharkBite type fittings which are more typically used in household plumbing - as opposed to RO systems which use the John Guest type fittings.

Yes, you can use SharkBite fittings for no soldering required - both sides just push in. I assume most of the RO piping is 3/8" or 1/4", so your local big box store may or may not have exactly what you need.

 

Thank you guys!

1 more question, is it better to cut before the elbow or just unscrew and get the male to female elbow fitting based on the pic below?

 

There really is no right answer to that, personally I have no issues soldering so if it were my system I would eliminate the joint which is a potential leak!

 

I do not see an elbow anywhere in your photo. Where are you thinking of cutting?

 

Marq1 +1 for eliminating the joint..... i dont have experience in soldering copper tubes.... so i guess i should just cut it before the female copper fitting... but that would be awkward with that U-shape thing that holds the tube...

Pilot Dane Regarding the elbow, I was thinking of just unscrewing that male fitting from the 1-stage filter and get a Male copper to PEX fitting because i will be installing the RO lower than the currently located 1-stage filter. Is there such a thing? or should i just cut it before the female and have a copper-to-pex fitting?

 

Actually it's the other way around, the fitting is fixed so you will need to spin the entire filter housing to remove, is there enough clearance and or what is connected on the other side?

A lot of times you dont have a choice but to cut them off to remove!

 

I see... i guess i will have to cut it

Thank you all so much for your help! really appreciate it