New to RODI

gregzz4 · #1 01-14-2012, 04:03 AM

Thanks Myka and I read up on drinking DI water. I see enough info to stay away from it.
For the membrane, I'll definately go with either a 75 or 150 with the next purchase, and I know what you mean about the restrictor. Too bad for me I didn't want to bother anyone before I bought the 100gpd unit I have now. It'll definately do the trick.
I could have bought the fancy shmancy Vertex automatic unit for what I've spent on what I have, but I have 2 gauges, 3 TDS meters and the ability to by-pass the DI.
5 of one and 6 and a half, or is that 7, of the other, oh, no wonder my budget is off

gregzz4 · #2 01-14-2012, 04:07 AM

So I got sidetracked with the repairs ...
A couple of my questions are, do I need to stir my storage tank ? Aerate it or heat it ? I'll gather heating it is a waste as it's in a warm room.

Myka · #3 01-14-2012, 04:13 AM

The RO/DI doesn't need to be stirred, aerated, or heated. Whatever you end up doing with the water will make it a moot point. You will either put it into a salt mixing barrel where you will heat and mix (aerate) it, or you will put it in a tub for top off where it will just sit and get cold anyway.

Honestly, I would be ticked right off if I had 8 ppm going into the RO and having anything other than 1:1 water ratio. Most membranes suggest 4:1 which is for flushing the membrane as it runs to keep it from scaling, but with only 8 ppm going in, imo you don't have much to worry about. That RO membrane will last you probably 5+ years with that little load you're putting on it.

With 160-180 ppm my RO membranes last 2-3 years. I would rather replace my RO membrane once a year than waste that much water. So far, I haven't had an issue though...my membrane is lasting just fine at 1.5:1.

gregzz4 · #4 01-14-2012, 05:23 AM

Thanks Myka. And I'm not so concerned about the ratio as I was about harming the membrane with too much back pressure if I was to shut off the waste valve. Turns out I have no control over it anyway. Unfortunately, unless I change something, the valving on my system allows this much to bypass. So far though, looks like I'll get about 75gpd. I can live with that