De-ionized water

JoeC

OK, just went through my entire personal library indexes looking for information in regards to de-ionized water and hydronic heating systems, especially those using glycol. Who's in the mood for giving a quick lesson?

Jack, CVMS

DI H2O

Okay, what's the question?

DI water is all we use when filling new boilers, and we generally use a minimum of 35% PG.

BTW, we're in Glennallen.

hr

DI or DM

water is good to use on all boiler installs, Glycol or not. Really depends on how goor, or bad, the on site water is. Check hardness and ph.
Hydronic chemical additives prefer this type of water also. Hydronic glycols and hydronic inhibitor chemicals are blended with hardness buffer chemicials. they get used up quickly with bad fill water.

hot rod

To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"

Brad White_2

Deinonized?

Are you sure?

Just to be clear and so I understand the term as you use it, the DI systems I have used (for process cooling in proton beam applications and pharmaceutical applications) is corrosive stuff, too pure for carbon steel. The lack of ions in the ultra-pure water rapidly seek to fill the void. Iron is an excellent candidate with any free oxygen being the catalyst.

We have to use 316L piping. Are you thinking RO (reverse osmosis)?
Just curious.

Generally, I filter the water to about 5 microns, soften and filter it of any free iron or magnesium or calcium and call it a day. I have a 2-gallon Neptune filter feeder with a 5 mic filter bag to continually polish the water in a sidestream/bypass loop.

hr

Dow engineering guide

recommend the use of distilled or deionized water to blend their glycols.

True distilled water is hard to come by in quantities as it is made by turning the water to steam and collecting the condensate. Expensive to buy also. Generally found on store shelves for steam irons My water treatment company tells me much of that grocery store distilled water is actually is just DI water. Be hard for the consumer to tell the difference.

DI or DM water goes through filtration process, along the lines of a softner but not a salt type ion exchange.

If site dilution quality has Chlorides and sulfates less than 25 ppm and hardness as CaCO less than 100 ppm, it may be acceptable.

Dow and other glycol suppliers will send pre-blended glycol if you do not want to hassle with finding the best blend water locally. Used to be only 55 gallon quantities would be pre blended. I heard they will now do 5 gallon pre blends with some notice. ChecK with Dow, Nobel or other glyclo providers.

Be sure you clean and flush the system well, or this too will ruin the inhibitor package in the glycol.

hot rod

To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"

Christian Egli

A free source of distilled water

The water that comes of the evaporator coil on an AC system is nothing else but distilled water. Pure condensate.

I have heard that store bought distilled water comes from this source. It makes sense and it is a wise use of a by-product. I guess you just filter out the dust particles before drinking.

Rain water has no hardness to it either, but not if collected from a roof.

John MacGregor_3

Free source

It may be free, and it may be pure or it may have Legionaire's disease bacteria in it.

S Ebels

Wouldn't do that

I sure wouldn't drink anything that comes off most of the A-coils that I see. YYEEEEeeeeccchh!!!!!!!!!!!