RODI Issues since moving to the area

[geemanaz]

Your best bet is give spectrapure call they can help you out most

 

[rEeFnWrX]

Spectrapure recommends not going past 80 psi on their membranes as you risk membrane perforation. I believe their rejection rates are based on 60 psi.


Also, if the water is that bad, it might be a wise idea to have multiple sediment filters... With the larger micron first... Example 1 micron to .5 micron. Make sure your final sediment filter has either a micron rating equal to or less than your carbon blocks otherwise you will use up/clog your carbon blocks much quicker.

 

[petesreef]

Is your RO setup with an auto top off float? I had the exact same issue, burning up DI. I stopped using the top off float and just filled my top off reservoir once close to depleted. I was getting whats called TDS creep. Small blasts of high TDS would hit the DI each time it needed a tiny bit of water and burn it up. Sounded unlikely to me but thats what my problem ended up being.

 

[HowManyClowns]

Yup it is. I have also stopped it auto filling, as I know it was contributing. Now I am flushing prior. Thinking about getting an auto flush kit and a booster pump

 

[petesreef]

I was gonna buy a booster and all that stuff too. I bought 2 membranes, filters etc. Literally just filling my top off reservior by opening the line to the float with a valve and manually shutting it off when full solved my problem. Sounds like yours too.

 

[HowManyClowns]

I am still getting high TDS after the membrane (new) and I have still burned half way through a DI cartridge since I just replaced it last weekend (have made 90 gallons)

 

[HowManyClowns]

My TDS is down from 35 to around 20 average after running through the water softener but still needs some help

 

[HowManyClowns]

Mine isn't hooked to an ATO its hooked to a brute that I store water in with a float

 

[petesreef]

I was getting TDS around 28 after the membrane, after a month or so it has dropped to about 15 before the DI. I was talking to my RODI tech at my work and he said sometimes the membranes run a little high for the first couple hundred gallons.

 

[petesreef]

How often does that float call for water each day. If it doesnt run long enough it seems to beat up on the DI. I didnt believe it until stopped using the float.

 

[HowManyClowns]

Yea my other one ran 35 as well that was a year old. My source water is over 600 TDS without the softener, and around 450 with it

 

[petesreef]

if that float opens say 10-15 times per day only want ounces of water instead of gallons , there lies your problem. SPectrapure makes a device to limit how many times per day the float is allowed to receive water for this same reason.

 

[HowManyClowns]

It's hooked to a container that i store water in. I pull out 20-30 gallons per day (at one time) to make up saltwater.

 

[aguila88psi]

Is the di resin your using moist or dry? If dry it could lose capacity and not last as long.

 

[petesreef]

20-30 gal per day.. thats alot of water. Maybe its just the amount you use. IDK

 

[HowManyClowns]

Yea qty doesn't help It's good DI for sure

 

[rEeFnWrX]

A flush kit in its own won't stop the initial TDS creep. Flushing doesn't provide enough pressure to void the membrane of stagnant water. Add a T and a valve right after your membrane. Flush and then purge the first minute or two of water this way you also clear the water in the membrane.

 

[CSample]

My tap water comes in at 900 tds. I use 100 gallons a day. I burn thru, everything.

 

[HowManyClowns]

A flush kit in its own won't stop the initial TDS creep. Flushing doesn't provide enough pressure to void the membrane of stagnant water. Add a T and a valve right after your membrane. Flush and then purge the first minute or two of water this way you also clear the water in the membrane.

Yup I have been doing that, waiting for the TDS to drop to an ok number before running it through DI.

I am going to order an aquatec 8800 next and replace my membrane with the 99% rejection version. Also contemplating auto flush flow restrictor although I'm not convinced that's a great idea in my current situation

 

[aguila88psi]

Something you can also do is use a smaller id flow restrictor, it'll increase pressure on your ro membrane to bring tds down further and have higher throughput as in a one to one ratio of product to waste water, problem is your membranes will foul up faster.

What I do is use a single membrane flow restrictor on a dual membrane setup, I get a one to one ratio of product to waste water. Membranes last a couple years or more and I replace the DI resin much less so I guess you can pick your poison Lol, replace membranes more often or replace DI resin more often.