[Penguin]

I've got clear canisters on my RO/DI unit, and a color-changing DI resin, but I don't know what color it's supposed to turn from/to. It's been in about 6 months and I don't remember what color it started out as. I also have no instructions or TDS meter. Thanks for your help.

[Ninong]

If the D.I. resin is the type that changes colors, it will turn from black to brownish. At least that's what mine does. It changes from black to a reddish-brownish coloration.

[Penguin]

Hmm. I thought mine looked greenish when I looked at it. I'll have to look at it again tonight.

[dougc]

Get a TDS meter. It is a good investment. It will tell you whether your filter is doing a good job.

[Reefland]

Mine also starts out black and changes to a brown color as it becomes exhausted.

[Arctic Fox]

if they're white to start with they'll turn a greenish colour when they're used up.
if they're black to start with they'll turn brown or a reddish brown colour when they're used up.

Ironically those little resin ball/pellet things are the same thing that's in my brita filter I use to drink from, also there is a product out there called "Regeneratable Toxic Metal Sponge" by Kent, I believe the little resin pellet/ball things in there are the same thing as well.

[Penguin]

Mine must be the white-to-green type then. I checked it again and it definitely looks greenish.

Can anyone give me recommendations on a TDS meter? I've wanted to get one for a while but I'm having trouble deciding on one. Should I go with a handheld or an inline? What manufacturer? Thanks.

[Reefland]

Penguin,

It depends on the money you want to spend. The inline's are very nice because with the flip of a switch, you can see the TDS of the tap water and the TDS of the filtered water (I think that's how Gene's works). The handhelds on the other hand are very simple to use, and cost a bit less. You can still check both, just got to fill up a bowl of water from teh tap to sheck it.

I personally use a Hanna Hand Held TDS meter.

[dougc]

Ditto on the Hanna. That's what I have. There is no maintenance to these because they don't require constant calibration like a pH meter.

[Penguin]

What do you guys think of this TDS meter? Looks decent to me and its the cheapest I've seen.

http://airwaterice.com/product/TDS4TM


SPECIFICATIONS

• TDS Range: 0-9990 ppm (mg/L)
• Temp. Range: 0-80 degrees Celsius
• Resolution: 1 ppm, 1 degree Celsius
• Accuracy: +/- 2%
• ATC: Built-in sensor for Automatic Temperature Compensation of 1 to 50 degrees Celsius (33 to 122 degrees Farenheit)
• Power source: 2 x 1.5V button cell batteries (included)
• Battery life: over 1000 hours of continuous use
• Dimensions: 14 x 2.3 x 1.5 cm (5.5 x .9 x .55 inches)
• Weight: 34g (1.2 oz)

[dougc]

It looks like a good price. I don't think you can go wrong.

[xabo]

Originally Posted by Penguin

What do you guys think of this TDS meter? Looks decent to me and its the cheapest I've seen.

http://airwaterice.com/product/TDS4TM


SPECIFICATIONS

• TDS Range: 0-9990 ppm (mg/L)
• Temp. Range: 0-80 degrees Celsius
• Resolution: 1 ppm, 1 degree Celsius
• Accuracy: +/- 2%
• ATC: Built-in sensor for Automatic Temperature Compensation of 1 to 50 degrees Celsius (33 to 122 degrees Farenheit)
• Power source: 2 x 1.5V button cell batteries (included)
• Battery life: over 1000 hours of continuous use
• Dimensions: 14 x 2.3 x 1.5 cm (5.5 x .9 x .55 inches)
• Weight: 34g (1.2 oz)

I ordered one yesterday. I'll let you know how it performs. I got a Milwaukee CD 97 from them when I ordered my RO unit a couple of years ago. But my DUMB A$$ dropped it in a container while it was switched on. It still works, but I can't find the calibration fluid (M10080) to check the calibration.