RODI feed water temp?

[ceige]

So I now have a faucet adapter set up for my RODI. Will using warm water produce RO water faster? Before I had it hard plumbed to cold only so this is a new possibility for me. Haven’t made any yet but I heard using warm water was faster...........TIA

 

[Joel A]

warm water does make the membrane work faster... but where are you getting your warm water?

If you are drawing it from a hot water tank in your house, like most people would, it has been sitting in that tank collecting extra sediment and nasty stuff, which will make your filters have to take out more junk, making it so you have to change the filters out a lot sooner... so really quite counter productive....

 

[NateHanson]

Also, if you're using 50/50 hot/cold water from your tap to make RODI, and your rejection ratio is 4 to 1, then you'll use 50 gallons of hot water every time you make a 25g water change!

That's like taking a few extra showers. I think you'd start to notice the energy cost from doing it that way, and I can't imagine it would be worth the small increase in RODI production.

 

[JohnK]

I run my RO feed line through 25' of tubing coiled in a 5 gal bucket with a heater. Not sure it's worth it, but that's what I do....

 

[ceige]

rejection ratio is 4 to 1, then you'll use 50 gallons of hot water every time you make a 25g water change!

very good point nate

My water is inculded in my rent (hot too) so its not the $$ but it is a big energy waster...

 

[Jim Tansey]

I run my RO feed line through 25' of tubing coiled in a 5 gal bucket with a heater. Not sure it's worth it, but that's what I do....

Aha....the ghetto feed system......it works

Jim

 

[delta]

Aha....the ghetto feed system......it works

Jim

It definately does work. Not as good as a pressure pump but still works

 

[Greg Hiller]

I don't think using hot water for RO/DI is a good idea. If the water is being heated in a hot water heater, then flowing through copper pipes, I think you are more likely to have a higher level of dissolved metals in the water that then are going to have to be removed. It's okay to warm the incoming water to room temp in plastic tubing though. I partially cool my main tank doing this, but you need to be careful you don't get a leak in the coil and end up dumping tap water into your tank!

 

[Dave McReeferson]

I run my RO feed line through 25' of tubing coiled in a 5 gal bucket with a heater. Not sure it's worth it, but that's what I do....

Ah yes, the ole' bucket trick. I found this to make quite a large difference, adding a very small low draw power head helps even more, stick your hand in the bucket, you can feel the temp gradient in there. I think a lot of the heat escapes to the room if you don't add circulation to the set-up.

 

[jbishop]

If you had a sump you could also do this in the summer to help cool the tank.