Question about water...

[ErikH]

My RO is a PH of 9, but after I add salt it goes back to normal.

[tebstan]

Wow. Why so high? did you set it up that way on purpose? Some RO is at 7...

[Europhyllia]

wouldn't RO by definition have to be right around neutral (7)?

I mean we bother with RO to remove stuff. Once everything is removed all you should have is water without any additives. Pure water pH is around 7.00 at 77F

[hobogato]

yep, pH of RO/DI should be around 7.0

tap water here in SA is about 8.3

[BuckeyeHydro]

Fun fact to know and tell-->
Guess what is inside a water softener?
Answer: Cation DI resin.

Remember that there are many many different kinds of DI resin. What is typically called a softening resin is a cation resin that can be recharged by exposing it to high levels of sodium. That's why you have that small tank full of salt pellets nest to your water softener.

The post above was exactly right - the softening resin removes calcium and magnesium (the two most common ions that make water "hard," and exchanges them for sodium ions.

If you have a water softener, by all means provide the softened water to your RODI system.

Russ

[vman181]

Fun fact to know and tell-->
Guess what is inside a water softener?
Answer: Cation DI resin.

If you have a water softener, by all means provide the softened water to your RODI system.

Russ

Would this help your filters last longer if it was run through a water softener first?

[BuckeyeHydro]

Just like you might see hard water deposits on a faucet, these deposits ("scale") will form inside the membrane and shorten its life span.

Russ