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3_high_low
02/07/2002, 01:18 PM
Hi Randy,

Is there a way to test specifically for silicates without ICP? Or should I get a TDS meter?

My R/O membrane is over ten years old:eek1:. I think I'm due for a replacement and perhaps a DI cartridge add on. What do you think?

Thanks:)

Randy Holmes-Farley
02/07/2002, 01:25 PM
Hach makes a nice silica test kit (IMO). Make sure you get the low range kit (Si-7; number 22550-00), that can easily read sub ppm Si.

3_high_low
02/07/2002, 01:36 PM
Ah, thank you. Do you know if any LFS sell that kit? (We're both in the Boston area.)

Thanks again!

Randy Holmes-Farley
02/07/2002, 01:45 PM
People usually get them directly from Hach: www.hach.com

I believe that there are other silica tests around (salifert?) but I have no experience with them.

tatuvaaj
02/07/2002, 03:20 PM
I am using the Salifert Si test.

It is very easy to use and has a range of 0 - 3 mg/l (as SiO2). Smallest color change indicates 0.03 mg/l (if the kit really works which I can't confirm) and anything above 0.25 mg/l is really easy to detect since the color change at that point is fairly strong.