Buying RO/DI water

[tangir1]

Umm... I don't know... maybe a "RO/DI" rated at 25,000 gpd, and it is smaller than a regular faucet?

I am sure I will pay $100K for it if it can putput water with higher TDS than tap water! Quit a gadget, don't you think?

 

[John_Brandt]

What happens to TDS when the DI resin becomes fully exhausted?

 

[reefNewbie]

my lfs had ro water that was 526 TDS when I tested it. Too bad i had already bought and used about 70 gallons of it.

 

[tangir1]

>...What happens to TDS when the DI resin becomes fully exhausted?

It is not easily quantificable, but in almost all cases, the resin will "let go" of some of the junks that it absorbed, then started to work a little by absorbing some ions back. The net affect is almost zero, but if you are not lucky, you may end up with worse water than you started with.

I usually recharge/change the resin if the conducitivity is more than 0.33 uS (If I remember correctly.)