Ro/DI

Looks rather straight fowared to me in their design.. Aqua FX Barracuda 4-Stage Reverse Osmosis Water Purifiers And all I saw was one TDS meter .. And the fact that you are in Fl. To exhauste a D/I cratridge in 2 months is not unusal at all the water if so soft. Look at the mounting block for the TDS meter and see where its being fed from The inlet or the output water . Long story short I'd just recharge the D.I

 

The in-line TDS meter isn't readin the tap going in, but it is reading the TDS coming out of the membrane. That's why it's only reading 003 ppm on the "in" side. The "out" reads the DI. If you want to recharge the DI, be very careful.

 

Thanks water guy My mistake or wrong wording I should have said to replace the resigns in the D/I chamber.. No recharge it

 

A little off topic, but in the same boat. I am currently running a 5 stage RO/DI, and have noticed a decrease in overall production from 75 gpd to about 45 gpd. The filters were all replaced in January and on average I make 30 gallons of water a week. Inlet pressure is 60-65psi and there is strong flow into the membrane but little product water. Also my tds at the tap is ~275ppm and the water after the filters is ~300ppm, can that be? My tds after the membrane (which is a 1.5 years old) is ~20ppm. Just wondering if that is a sign of dirty filters or a bad membrane. I live in Ohio so the water is very cold in the winter but my production then was much higher, what gives.

Any ideas would be great.

Thanks,
Dustin

 

Dustin, your membrane (from the TDS test results you mentioned) has about a93% rejection rate. Are you on city water or well water? What is the GPD rating of your membrane? What's the hardness of your water? If it's lower than 100 GPD, then it should have between a 95% - 99% rejection rate. Anything below this will force the DI to work harder in removing the TDS; exhausting it faster. The reason I asked what kind of water you're on is to determine if there's any mineral fouling. Hardness is another problem. It can cause calcium to build up on your membrane, slowing the production rate down and cause the TDS to be high.

 

One thing that can cause resing to be exhausted is TDS Creep. This is caused by a high pressure after the membrane and a lower pressure before. Are you useing a float valve for an auto top off? Or is the ro system hooked to a pressure tank to a sink?

 

the_h2o_guru
I'm on city water and the hardness is 7.7 dKH out of the tap. My membrane is a 75gpd, and I'm flying through DI refills. What can I do to prevent mineral build-up or calcium?

dngspot
I my unit is running straight into a collection bucket. I do not have a float valve or a pressure tank (i wish i did it would save me from manually filling a water pitcher). I do have an auto top off but it is not hooked up to my RO/DI unit.

Thanks for the feed back,
Dustin

 

I went to the Aqua Dealer and it turns out they did not install a flow restrictor into the waste line, which inadvertently caused way to much water to be going through the DI and being wasted. (I was filling up my washing machine with the extra water.) Anyway with the restrictor in everything seems to be doing great now.

 

You have something piped wrong as I mentioned if you have waste water from the D / I The water leaves the R/O membrane housing then enter the D/I housing The restrictor will make no difference.. If it was purchased and set up or piped up by the water filtration experts you need to have them re pipe it. All the waste water stopes at the R/O outlet housing

 

Hmm,, Yes it was pre set up when I purchased it. Maybe I am saying something wrong. Now I am really baffled and will have to go really look at the way the diagram shows it and the way it is actually set up