ro temperture

zonco · 02/24/2006, 03:15 PM

I was wondering if u guys run your water temperture at luke warm, warm or cold when u are filtering your water through your rodi filter ?

Pilot Fish · 02/24/2006, 03:23 PM

Run it cold, I was always told that it runs through the unit easier and you don't waste energy heating the water that would not stay warm in your r/o storage tank without a heater anyway.

saltygeek · 02/24/2006, 03:23 PM

I tried to run warm water through mine to speed it up but the water output is so slow that by the time the water gets to the ro its cold again from sitting in the pipes.

fragaholic · 02/24/2006, 03:24 PM

I read that it is recomended to run it cold. warm or hot water can damage the ro membrane.

saltygeek · 02/24/2006, 03:28 PM

well i guess it would depend on what you are calling cold. The cold water coming out of my tap at this time of the year is much colder than normal so it decreases the efficiency of the unit so warm water would be around room temp.

fragaholic · 02/24/2006, 03:31 PM

I would also think that using warm water would shorten the life of the filters because you are using water from the waterheater. Lots of minerals and silicates build up in water heaters. it is best to use h2o from the fresh water source (cold water).

saltygeek · 02/24/2006, 03:39 PM

Good point

zonco · 02/24/2006, 04:19 PM

so cold ,ok makes sense guys thanks

steve5520 · 02/24/2006, 04:30 PM

Membranes are rated with water at 77 degrees F. Colder than that will reduce output significantly.
I'm not sure how much warmer than 77 deg you can go before damage to the membrane occurs.

I think the Dow membranes are tested at 50psi line pressure.

I've read many times where people get a long length of plastic tubing and coil in up in a bucket with water and a small heater set at around 77 degress. This will help warm the water and get better output.

Someday I need to get some tubing and do it myself, water is getting too expensive to waste more than needed.

mcegelsk · 02/24/2006, 04:40 PM

All are designed for 77 degrees, steve5520 is correct. Some RO/DIs are rated at 50# these are the great since its usually around normal household pressure. However there are some "cheaper" units that need around 65# and therefore usually need a booster pump.

02/24/2006, 03:15 PM	#1
zonco Registered Member Join Date: Apr 2004 Location: Pewaukee, WI Posts: 426	ro temperture I was wondering if u guys run your water temperture at luke warm, warm or cold when u are filtering your water through your rodi filter ?

02/24/2006, 04:30 PM	#9
steve5520 Registered Member Join Date: Dec 2004 Location: St Clair Shores, Michigan Posts: 18	Membranes are rated with water at 77 degrees F. Colder than that will reduce output significantly. I'm not sure how much warmer than 77 deg you can go before damage to the membrane occurs. I think the Dow membranes are tested at 50psi line pressure. I've read many times where people get a long length of plastic tubing and coil in up in a bucket with water and a small heater set at around 77 degress. This will help warm the water and get better output. Someday I need to get some tubing and do it myself, water is getting too expensive to waste more than needed. __________________ 'course that's just my opinion, I could be wrong Current Tank Info: 150 gal reef

02/24/2006, 04:40 PM	#10
mcegelsk Registered Member Join Date: Jan 2006 Posts: 305	All are designed for 77 degrees, steve5520 is correct. Some RO/DIs are rated at 50# these are the great since its usually around normal household pressure. However there are some "cheaper" units that need around 65# and therefore usually need a booster pump. __________________ http://mattcegelske.com Current Tank Info: Hiatus

02/24/2006, 03:23 PM	#2
Pilot Fish Registered Member Join Date: Aug 2005 Location: JERSEY Posts: 191	Run it cold, I was always told that it runs through the unit easier and you don't waste energy heating the water that would not stay warm in your r/o storage tank without a heater anyway.

02/24/2006, 03:23 PM	#3
saltygeek Registered Member Join Date: Jan 2006 Location: NJ Posts: 644	I tried to run warm water through mine to speed it up but the water output is so slow that by the time the water gets to the ro its cold again from sitting in the pipes.

02/24/2006, 03:24 PM	#4
fragaholic Registered Member Join Date: Mar 2005 Location: Roseville, CA Posts: 527	I read that it is recomended to run it cold. warm or hot water can damage the ro membrane.

02/24/2006, 03:28 PM	#5
saltygeek Registered Member Join Date: Jan 2006 Location: NJ Posts: 644	well i guess it would depend on what you are calling cold. The cold water coming out of my tap at this time of the year is much colder than normal so it decreases the efficiency of the unit so warm water would be around room temp.

02/24/2006, 03:31 PM	#6
fragaholic Registered Member Join Date: Mar 2005 Location: Roseville, CA Posts: 527	I would also think that using warm water would shorten the life of the filters because you are using water from the waterheater. Lots of minerals and silicates build up in water heaters. it is best to use h2o from the fresh water source (cold water).

02/24/2006, 03:39 PM	#7
saltygeek Registered Member Join Date: Jan 2006 Location: NJ Posts: 644	Good point

02/24/2006, 04:19 PM	#8
zonco Registered Member Join Date: Apr 2004 Location: Pewaukee, WI Posts: 426	so cold ,ok makes sense guys thanks