[U.S. wfp USER]

When setting up a static RO system what size hose is best to use?

Is it better to use a 1/2" vs. 3/8" so that you can get better water flow?

Thanks.

[Alex Gardiner]

This depends on your RO unit.

If you are using a 4040 RO then 1/2" hose is what you need.
If you are using a Merlin then 1/2" pipe (John Guest) is what you need
If you are using a 100-450gpd Ro then 1/4" pipe (John Guest) is fine.

A good guide is to look at what the individual components within the systems are connected with and then match this.

[U.S. wfp USER]

I am building a 4040 with 4"x20" prefilters so I was thinking that the 1/2" would be better for water flow purposes.

[Alex Gardiner]

Absolutely!