rodi hookup problem
- Thread starter armison89
- Start date
naprestsleep
blank
The rating is based upon a set PSI and temperature for the incoming water , most likely higher than what you have. Do you have a pressure gauge? Also warming the tap water(a loop of tubing running though a bucket of warm water or sump or such) is supposed to increase the production rate as these filters work better with warmer water, don't use hot tap water though.
I don't remember my PSI right now, and I use cold tap water. I get maybe 40GPD out of a 75GPD system if I am lucky.
I don't remember my PSI right now, and I use cold tap water. I get maybe 40GPD out of a 75GPD system if I am lucky.
Buckeye Hydro
.Registered Member
Filmtec membranes (not sure what you have) are spec'ed at 50 psi, 77 degree water, and 250 ppm feedwater.
Russ
Russ
Buckeye Hydro
.Registered Member
When a membrane goes bad, you typically see reduced (slowed) production and or higher TDS in the RO water.
Russ
Russ
Buckeye Hydro
.Registered Member
If it was sitting around for a few months unused, the membrane may be bio-fouled.
You should sanitize the entire system.
Russ
You should sanitize the entire system.
Russ
magdelan
Fish?
Again, let me reiterate. I changed the di, sediment, and carbon filters in Feb/March. I made my last batch of water in mid April. My psi was consistantly 40 and I had it attached via saddle valve dirrectly to my cold water line in the ceiling of my basement. It has sat unused since then.
Is it possible that armison's "well water" fouled up the membranes? I don't see how it can even be possible for the tds out to be more than ZERO.
Is it possible that armison's "well water" fouled up the membranes? I don't see how it can even be possible for the tds out to be more than ZERO.
Buckeye Hydro
.Registered Member
Membranes should be run no less than once a week to avoid biofouling. Remember that all the water in the system beyond the carbon block is not chlorinated. Stagnant water with no disinfectant makes a wonderful environment for microbial fouling.
Suggestion: Remove your membrane from the housing and smell both ends of the membrane - if the membrane is fouled, it will stink in a big way.
Amison - sounds like what you have is an RO system rather than an RODI system, correct? The three stages would be:
sediment filter
carbon block
RO membrane
If that's the case, you'll not see 0 ppm TDS water from the system. You'll need to add a DI stage to get that.
Those 90 gallon per day membranes are 75 gpd membranes where the vendor tells you to run it at a pressure higher than the manufacturer's spec. Given your low pressure and cold water, you'll see much less than 75 gpd. I ran some example situations through the calculator on our website as examples:
40 psi and 65 F water: 46 gpd, or about 2 gph
40 psi and 55 F water: 37 gpd, or about 1.5 gph
40 psi and 50 F water: 34 gpd, or about 1.4 gph
Russ
Suggestion: Remove your membrane from the housing and smell both ends of the membrane - if the membrane is fouled, it will stink in a big way.
Amison - sounds like what you have is an RO system rather than an RODI system, correct? The three stages would be:
sediment filter
carbon block
RO membrane
If that's the case, you'll not see 0 ppm TDS water from the system. You'll need to add a DI stage to get that.
Those 90 gallon per day membranes are 75 gpd membranes where the vendor tells you to run it at a pressure higher than the manufacturer's spec. Given your low pressure and cold water, you'll see much less than 75 gpd. I ran some example situations through the calculator on our website as examples:
40 psi and 65 F water: 46 gpd, or about 2 gph
40 psi and 55 F water: 37 gpd, or about 1.5 gph
40 psi and 50 F water: 34 gpd, or about 1.4 gph
Russ
Buckeye Hydro
.Registered Member
Buckeye Hydro
.Registered Member
OK - then you sure should see 0 ppm TDS out of the DI. So -
Pressure = 40 psi (90 gpd is to be produced at 60 psi with 77 F water)
Tap water TDS=137 ppm
RO water TDS=???ppm
DI water=0ppm
Pressure = 40 psi (90 gpd is to be produced at 60 psi with 77 F water)
Tap water TDS=137 ppm
RO water TDS=???ppm
DI water=0ppm
Buckeye Hydro
.Registered Member
Still need to know your RO water TDS.
Also - please check your waste water to purified water ratio. How? Line up 7 or 8 idenitical cups in front of your system. With your waste water tube in one hand, and your purified water tube in the other, how many cups do you fill with waste water in the time it takes to fill up one cup with purified water?
Russ
