Cold temps and your RODI system

trackfast

trackfast

Princess Trainer
Has anyone tried warming the cold water supply into their RODI systems during the cooler/cold weather? I never have; I just recognize that the ratio of good water to waste water is lowered during the winter months. I was thinking about doing something to raise the temp of water supply this year and check out the result vs the inconvenience.
 
When i had big tanks i just used an agricultural stock tank and heater as a reservoir to feed pump into the ro/di
it worked in the winters , but law of diminishing returns.. , i don't go thru enough ro/di to make it worth the hassle nowadays
 
Hmm, I can't imagine how raising the water temp of the water that already reached your house would matter. It must be the water coming in the winter has more contaminates.

For example, you don't want to use your hot water because of the contaminates from your water heater.
 
I just recently changed my ro membrane from 75 gpd to 150 gpd, and let me tell you...I'm really making water now! Problem is, now I'm getting 2-3 TDS. Brand new DI Resin too. Is this typical with these membranes, or could it have something to do with the colder water/weather? Should worry about 2-3 TDS?
 
I have. I ran a long supply line before getting to the unit. The supply was coiled up and placed in a 5 gallon bucket with tap water and a heater. The supply water, in theory, heated up before making it to the unit. I am not sure if that made a difference but you have to turn off your heater and or top off water in 5 gallon bucket when not in use.
I placed a flow restrictor on my unit which helped out - HUGE -so I stopped heating water, as it gets colder maybe i will again.
 
What I ended up doing to warm up the water was run both hot and cold to the RODI unit and plumb them into a Siamese before the RODI unit. I placed a ball valve on the hot side to regulate the temperature. Just make sure you dial back the hot water, you can damage the membranes if the water is too hot.
 
Last edited:
labas39 said:
Hmm, I can't imagine how raising the water temp of the water that already reached your house would matter. It must be the water coming in the winter has more contaminates.

For example, you don't want to use your hot water because of the contaminates from your water heater.
Click to expand...

No different than using water from the tap. Any sediment that's in your water heater is built up over time and settles at the bottom of the tank. That slow trickle through an RODI wont stir up the tank.
 
labas39 said:
Hmm, I can't imagine how raising the water temp of the water that already reached your house would matter. It must be the water coming in the winter has more contaminates.

For example, you don't want to use your hot water because of the contaminates from your water heater.
Click to expand...


Every ro membrane gives a rated output based on 2 conditions temperature and pressure (most are in the 70-80 degree range and around 60 psi). If pressure or temp is lower output will be lower than rated output. Its plain and simple, has nothing to do with more contaminates in the winter.
 
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