Do you run your RO/DI all the time?
- Thread starter exsequor
- Start date
CStrickland
New member
Why would you run a rodi all the time?
I have a 90 gpd spectrapure refurbished, waste ratio is 3.5. I use 135 gallon a month for topoff (a gallon a day), and 180 gallons on 10% weekly changes. Total monthly water usage is 315 gallons on a 120g tank, maybe a couple extra gallons to clean testing vials and tank glass.
I have a 90 gpd spectrapure refurbished, waste ratio is 3.5. I use 135 gallon a month for topoff (a gallon a day), and 180 gallons on 10% weekly changes. Total monthly water usage is 315 gallons on a 120g tank, maybe a couple extra gallons to clean testing vials and tank glass.
tkeracer619
New member
Leaving it on all the time is bad for it. It is good to make a larger batch of water less frequent. It is even better if you can bypass the DI and run the first gallon or two down the drain. Best case scenario is you fast flush the membrane before and after use.
I make roughly 400gal at a time and use somewhere around 10 gallons a day for top off.
I make roughly 400gal at a time and use somewhere around 10 gallons a day for top off.
exsequor
New member
I just got my 150gpd. I flushed it for 30 minutes with the flush valve engaged as per the instruction manual. I have a 175 storage tank + 55 gallon storage drum
My previous ro/di couldn't keep up with all that storage capacity combined with my daily water requirements of 20 gallons between all my tanks.
I just hooked up the 150gpd yesterday and it's filled my 230g storage system about 1/4 full so far. I'm HOPING to be able to fill the 230g ro.di store system and be able to turn the unit off, but we will have to see.
It seems you guys must have bigger RO/DI's then 150gpd, or you guys have smaller store tanks or less daily water requirements or? I don't want to assume, that why I'm asking, so thank you. I'll try not to run the ro/di all the time, I just don't know yet, if that's possible.
My previous ro/di couldn't keep up with all that storage capacity combined with my daily water requirements of 20 gallons between all my tanks.
I just hooked up the 150gpd yesterday and it's filled my 230g storage system about 1/4 full so far. I'm HOPING to be able to fill the 230g ro.di store system and be able to turn the unit off, but we will have to see.
It seems you guys must have bigger RO/DI's then 150gpd, or you guys have smaller store tanks or less daily water requirements or? I don't want to assume, that why I'm asking, so thank you. I'll try not to run the ro/di all the time, I just don't know yet, if that's possible.
Name That Tuna
New member
My output of water is 1 gallon per hour, not including waste. Turned on just in advance of needing it. I keep 5gal for topping off a 90gal. Setting up an additional 55 gal this week, and just order d an extra membrane for $30, that re-filters waste water, alleging to double good water.
Sent from my iPhone using Tapatalk
Sent from my iPhone using Tapatalk
joshbrookkate
New member
I don't think it's a problem to run it all the time if you need the water. It's running it for short periods, off and on, that is bad for the DI resins. It's inefficient. Best to make at least 30 gallons at a time.
tkeracer619
New member
My RO makes 180gpd. Dual Spectrapure 99% membranes with a booster pump.
Two 200gal storage tanks. One for RO that has it's own DI closed loop and one for Salt.
Two 200gal storage tanks. One for RO that has it's own DI closed loop and one for Salt.
exsequor
New member
Oh I have a auto shut off kit for my ro/di's (float switch with the ro/di solenoid)..I'm just saying I haven't had to turn my ro/di's off in forever. Hoping going from a 55gpd to 150gpd will let it be able to shut off every now and then, but if not, as was said earlier, running it all the time shouldn't be bad per-say, I'll just have to replace the membranes more frequently, obviously.
Well I'd imagine the public aquariums got the big RO's, but I can't imagine I'm the *only* one to have my Ro/di not quite keep up with my water needs!
Well I'd imagine the public aquariums got the big RO's, but I can't imagine I'm the *only* one to have my Ro/di not quite keep up with my water needs!
R33FLIF3
New member
my BRS 6 STAGE UNIVERSAL PLUS RO/DI SYSTEM - 75GPD makes about 120 GPD ever since i upgraded the water supply line from 1/4 to 3/8th with 2 gals waste for every 1 gal made
i use my RO/DI system for drinking water and icemaker so its always on... bypassed before the DI resin with a one way valve.
i use my RO/DI system for drinking water and icemaker so its always on... bypassed before the DI resin with a one way valve.
Sounds like you have a supply pressure problem or something going on here. If your only using on average, 20gpd, then anything over a 20gpd production membrane will keep up with your needs. Your storage capacity has nothing to do with you not keeping up. Its just storage. Even if you had a 21gpd membrane, you would be keeping up plus filling your storage. It would take 230 days to fill it... but you get my point. Mass balance is In - out. If that number is positive, you are keeping up, if its not, you aren't.
tkeracer619
New member
You're getting 96 gallons per day which isn't too shabby. It does specify a 120gpd membrane so you're not too far off there.
Pressure tanks aren't ideal for our application. Typically we fill a non pressurized reservoir like a 55gal brute trashcan or an ace roto mold poly tank. I make about 400 gallons at a time.
The single most expensive part of making RODI water is DI resin. Consumption varies depending on the incoming water and what is in it. To save money having a membrane that rejects a very high percentage is ideal. Your system has a 90% rejection membrane which is rather low. A filmtech 75gpd which is considered the standard is somewhere between 96 to 98%. You can buy membranes such as the spectrapure 99% membranes which will be 98 to 99% rejection. A 90% rejection membrane will eat up DI resin quickly, especially if your incoming tds is high. Some people are blessed with low incoming tds and can get away with lower rejection. Time and a TDS meter will tell the quality of water you are getting.
shadowmonster
New member
Following...
I've seen too many threads over the years where that RO/DI begets the same stuff that bad tap water does...
I've seen too many threads over the years where that RO/DI begets the same stuff that bad tap water does...
