RODI & temp

[sp1187]

wondering, is anyone else running their RODI at the recommended operating temperature?
or do you just turn on the cold water faucet?

 

[Gtinnel]

I just run mine off of a cold water line. I think running a feed line that mixes hot and cold water to the proper temp would be too time consuming. Also, I'd be afraid of getting it wrong and the water getting too hot and damaging my membrane.

 

[sp1187]

mine's lined in off the end of the washtub faucet in the fish room.
used an instatemp thermometer and then marked the faucet where the correct temp was. when running it I turn the water on to the cold side of the mark. have to say, the jugs are filling in a shorter amount of time since I did this, instead of just turning on full cold. DI is lasting longer also.

 

[Mike from TN]

I’m tapped into the cold side of the washing machine taps. I only make two or three gallons at a time and my daily top off is about 1.5 quarts. I keep the jugs at room temp so there isn’t much of a temp swing when I top off. Sea water comes from the LFS.

 

[KStatefan]

I use cold. My waste ratio goes up in the winter when the water temp drops. I have my ratio set to July source water temp. I do not think the added cost of providing otimal water tempature is worth it.

 

[sp1187]

I use cold. My waste ratio goes up in the winter when the water temp drops. I have my ratio set to July source water temp. I do not think the added cost of providing otimal water tempature is worth it.

I'm on a well.

 

[01xp]

I use cold but my set up is a little different so I don't see any changes in waste product ratio

 

[piranhaman00]

I use cold when im not in a hurry, when I am in a hurry I use 90F water, I can make about 450 gallon/day on a 200gpd system, but my TDS goes up from 2 to 8 after RO and so I use ***** resin, only when in a pinch.

 

[Zach B]

Just cold water here

 

[Mike konesky]

Cold water for best tds. I'll plug in the inline water heater for turbo mode if needed. Water temperature is around 75 out of membranes, but tds doubles.

 

[Poof No Eyebrows]

Cold side of washing machine here as well.

 

[nereefpat]

Like the others, I just run the cold water line to mine.

My feed water is about 55 degrees all year. The gallons produced per day would increase if I :
1. heated the water
2. Pumped it through the membrane at a higher pressure

I don't think it's worth the trouble, but I could be wrong.

 

[Gtinnel]

I run mine off of the cold side cleanout of my tankless water heater and my system is run by a controller and solenoids. Most of the time when it is running to keep my ATO full I don't even know when it turns on or off. The only time I manually start it is when I am filling my mixing station.
If I had to manually attach it to a faucet on a sink everytime I made water I would probably try to make it closer to the temp for quicker production of water, but the way mine is plumbed it isn't worth the hassle.

I'll plug in the inline water heater for turbo mode if needed.

Is there some kind of purpose made heater for this application that you use or is it a heater for something else that you just got to work?

 

[infinite0180]

I just use the cold side of the washer, its easier than hooking up to the laundry faucet everytime. That being said i do notice its slower in the winter when the water is ice cold.

 

[Susan Edwards]

hooked into the faucet outside-runs through the screen in my kitchen window. I have a heater for the winter in my ato container

 

[ZoWhat]

I run mine off my NEIGHBORS cold water line

 

[Mike konesky]

I run mine off of the cold side cleanout of my tankless water heater and my system is run by a controller and solenoids. Most of the time when it is running to keep my ATO full I don't even know when it turns on or off. The only time I manually start it is when I am filling my mixing station.
If I had to manually attach it to a faucet on a sink everytime I made water I would probably try to make it closer to the temp for quicker production of water, but the way mine is plumbed it isn't worth the hassle.


Is there some kind of purpose made heater for this application that you use or is it a heater for something else that you just got to work?

I'm using a 1400 watt Bosch inline water heater. 4 gallon tank I believe. $150 on Amazon. If you do go that route be careful not to cook your membrane. Too hot will ruin them.

 

[Gtinnel]

I'm using a 1400 watt Bosch inline water heater. 4 gallon tank I believe. $150 on Amazon. If you do go that route be careful not to cook your membrane. Too hot will ruin them.

Ok thanks. I was more curious than anything else if there was a heater made specifically for rodi filters. I have no real interest in using warmer water to feed my filter.

 

[redfishbluefish]

Just seeing this....the temperature rating you see associated with a membrane is the temperature at which that membrane gets it's rating....i.e. 75gpd. It does not mean you need to run your RO at that temperature. Actually you don't want to introduce any hot/warm water....cold only. To quote @AZDesertRat, a past RO/DI expert:

Use only cold water, never try to temper or blend hot and cold.
Cold water actually treats better and will give you lower TDS. It is more viscous, more dense, so the contaminants do not flow through the RO membrane as easily giving you a better rejection rate.

 

[piranhaman00]

But it goes so slow.....