RO/DI water intake temp

benj2112 · 01/07/2017, 09:06 PM

Does anyone take the time to warm the water going into their RO/DI filter? If anyone does, how much are you able to warm the water up?

I haven't fired mine up for the first time yet, but I was wondering if my water would be very cold as it is well below zero outside. I filled up a bucket of water coming out of the cold tap and it measured 60 degrees.

thomas.torode · 01/07/2017, 09:13 PM

Warm it but not anything more than 72-78 if you can.
I don't know anyone who puts warm water through their unit though.

Good luck!

reefer1970 · 01/07/2017, 10:15 PM

Cold water is supposed to slow it down through the membrane. I just moved to a house with a well and thought that might be part of my slow production but just added a booster pump and making loads of rodi now. No warm water needed

Sent from my iPhone using Tapatalk

bnumair · 01/07/2017, 11:44 PM

Bulkreefsupply states:
• Hot water should never be used with the RO system as it can damage the RO membrane and may also contain additional contaminants. For
this reason, only water from the cold water supply should be used.
• For optimal results, water pressure should be at least 50 psi entering the membrane. If operating pressure is under 50 psi, a reduction in water
production and a lower rejection rate may be experienced. If water pressure is approaching 35 psi, consider adding a booster pump to increase
performance.
• A ratio of 4:1 waste water to purified RO water is normal. The waste water from the black line contains the dissolved solids from the source
water and should not be used in your aquarium.

Ou8me2 · 01/08/2017, 03:55 AM

Yep warm water will damage your RO membrane for sure. I just deal with the slower production but I'm getting a booster pump soon and that will solve it.

pisanoal · 01/08/2017, 05:36 AM

Quote:

Originally Posted by Ou8me2

Yep warm water will damage your RO membrane for sure. I just deal with the slower production but I'm getting a booster pump soon and that will solve it.

Hot water will damage the membrane. If someone went through the trouble of warming up the water to anything below what the membrane is rated for, they would experience better rejection rates. We use an RO system at work for boiler water treatment to cut down on the chemical cost of regenerating our deionizing units We use high temp membranes because the source water that feeds them is 120 degrees. Helps with rejection rates, but when the system that heats that water is offline, differential pressure skyrockets and rejection rate goes to crap.

All that being said, 10 degrees isn't going to make a huge difference for our systems, and a booster pump like you are doing is way cheaper, easier and more efficient for our needs.

kaz1961 · 01/08/2017, 08:34 AM

I accidently turned on the hot water into my ro/di. Just as everyone said I blew out my membrane. That was a $59 brain fart!

neiltus · 01/08/2017, 09:24 AM

My water coming out of the waste line this morning is about 63 degrees.

Your daily production will slow down, you probably will not notice this. Honestly your looking for a solution to a problem that is not.

benj2112 · 01/08/2017, 09:53 AM

Thanks for all the replies everyone! I will just let it run and see how it goes.

01/07/2017, 09:06 PM	#1
benj2112 Registered Member Join Date: Feb 2004 Location: Minnesota Posts: 27	RO/DI water intake temp Does anyone take the time to warm the water going into their RO/DI filter? If anyone does, how much are you able to warm the water up? I haven't fired mine up for the first time yet, but I was wondering if my water would be very cold as it is well below zero outside. I filled up a bucket of water coming out of the cold tap and it measured 60 degrees.

01/07/2017, 09:13 PM	#2
thomas.torode Registered Member Join Date: Feb 2016 Location: San Jose, California Posts: 158	Warm it but not anything more than 72-78 if you can. I don't know anyone who puts warm water through their unit though. Good luck! __________________ Red Sea MAX 250, 25 Gallon Nano

01/07/2017, 10:15 PM	#3
reefer1970 Registered Member Join Date: May 2015 Location: Grosse Pointe, MI Posts: 422	RO/DI water intake temp Cold water is supposed to slow it down through the membrane. I just moved to a house with a well and thought that might be part of my slow production but just added a booster pump and making loads of rodi now. No warm water needed Sent from my iPhone using Tapatalk

01/07/2017, 11:44 PM	#4
bnumair Dr. Reef at ur service Join Date: May 2009 Location: Tulsa, Ok, USA Posts: 7,751 Blog Entries: 15	Bulkreefsupply states: • Hot water should never be used with the RO system as it can damage the RO membrane and may also contain additional contaminants. For this reason, only water from the cold water supply should be used. • For optimal results, water pressure should be at least 50 psi entering the membrane. If operating pressure is under 50 psi, a reduction in water production and a lower rejection rate may be experienced. If water pressure is approaching 35 psi, consider adding a booster pump to increase performance. • A ratio of 4:1 waste water to purified RO water is normal. The waste water from the black line contains the dissolved solids from the source water and should not be used in your aquarium. __________________ Water Quality: NO3 0,Phos 0,Cal 440,Alk 7.5,Mag 1300 "Reef Fast, You Crash, Reef Slow, You Pass" Mike's Reef 3:16 Current Tank Info: 350g DT,95g sump, 50g Frag tank, 4800gph return 4x Sea swirls. 6x AI Vega Color. 200# Pukani rock, dual recirculating skimmer, Biopellet, GFO Carbon rx's, Cal rx. Closed loop. 1.5hp chiller, genesis renew. Apex & RKE

01/08/2017, 09:24 AM	#8
neiltus Registered Member Join Date: Jul 2016 Posts: 415	My water coming out of the waste line this morning is about 63 degrees. Your daily production will slow down, you probably will not notice this. Honestly your looking for a solution to a problem that is not. __________________ Build Thread http://www.reefcentral.com/forums/showthread.php?t=2592260

01/08/2017, 03:55 AM	#5
Ou8me2 Registered Member Join Date: Feb 2016 Posts: 743	Yep warm water will damage your RO membrane for sure. I just deal with the slower production but I'm getting a booster pump soon and that will solve it.

01/08/2017, 08:34 AM	#7
kaz1961 Registered Member Join Date: Apr 2011 Posts: 191	I accidently turned on the hot water into my ro/di. Just as everyone said I blew out my membrane. That was a $59 brain fart!

01/08/2017, 09:53 AM	#9
benj2112 Registered Member Join Date: Feb 2004 Location: Minnesota Posts: 27	Thanks for all the replies everyone! I will just let it run and see how it goes.