TDS specs??

[AZDesertRat]

If you have a water softener always use soft water if possible, the membrane will last 10 years versus 24 to 36 months. Keep the waste at 4:1 if it is very hard which I suspect it is and do not use a low waste system or it will end up costing you much more in membrane and DI replacements than the amount of waste water costs.

 

[EZMAC114]

Yeah we do have really hard water and I don't have a water softener. With the adjustable spectrapure waste water can I be put to 4:1 or only 2:1 and 3:1?

 

[AZDesertRat]

The low wast systems come with a 3:1 and 2:1 restrictor, their normal systems come with an untrimmed restrictor you yourself adjust to 4:1.

 

[EZMAC114]

I can't find any systems on their site that say 4:1

 

[AZDesertRat]

CSPDI at the bottom of the page:
CSPDI RO/DI Systems

MPDI is 3:1 but can be aqdjusted to 4:1
MaxPureMPDI 90-GPD RODI System

Refurbished at only $130 and is the same MPDI but less money due to possible scratches on a housing or bracket
Refurbished 90-GPD RODI System

MaxCap
MaxCap Standard 90-GPD RO/DI System

You can go to 3:1 depending on how hard the water is but i would lean towards 4:1 myself and have my membrane and DI last longer.

 

[EZMAC114]

So if I get the cspdi I can't go 4:1 but I can with the mpdi

 

[AZDesertRat]

Any RO/DI can and should be 4:1 if you have hard water. An untrimmed capillary tube flow restrictor is $5-$6 and can be trimmed once you have the system installed and know your parameters.

 

[EZMAC114]

Oh ok perfect...thank you