RO question/advice

[hillegom]

13 ppm is typical for the lower mainland. It will vary a little, depending on the season.
Most ro systems typically "waste" 4 gal for every one they produce. You can buy more efficient ones, but I think the membranes won't last as long.
How many gpd (gal per day) does the one from costco produce? If its 25 gpd, then one gal per hour, 25 divided by 24hrs is about what you are getting.
That is assuming a water pressure of at least 60 psi in your house and room temp water going through the filters.
If you want to decrease your TDS to 0 then you need to add a DI filter.

[Junmity]

I have a ball valve on my waste water line.

i have it fully open now but at that rate it seems to be wasting more than 4 g per ro g.

if i restrict this flow, will it slow down production?

thanks for all you help.

[tim the toolman]

I have my waste restricted to about 50/50 with the fresh and I do not notice a reduction in production. Your system may be different though. I have been running it this way for over six months and I am still getting 0ppm and about 400ppm on my waste (or should I say laundry) water.

[Cal_stir]

if it is a straight RO unit, you won't get 0 TDS, you need RODI

[Junmity]

is 2 or 3 ppm acceptable for aquarium setup?

[tim the toolman]

It's not that bad, I doubt even those running ro di are changing filters at 2ppm but if your not goin to shoot for 0 ppm 13 ppm out of the tap isn't really that extreme either.

[Junmity]

Really, 13 ppm is the same as 2ppm?

i'm setting up a 120g so waiting for the stuff to produce is a PITA...

if that's the case would you recommend that the juice is not worth the squeeze?