After separation and recharge, your left with brown resin and and green resin. The green will turn color as its exhausted but not the brown. You just fill your cartridge with half of each resin separated by a thin filter pad. Then when the green all turns purple its time to recharge both resins again.

One last thing Chris, it's better to recharge the resins when the green resins are no more than 3/4 exhausted. Just because there is some life left in them doesn't mean the brown resins haven't been exhausted. All depends what contaminents are in your water. A better way is to use a TDS meter as opposed to relying on the color change.

Where do you buy your resins, I've got the Aquarium Pharmaceuticals DI filter, but the resins are mixed together.

Doug

http://www.lmas.org/diy/RSH%20Tap%20...structions.pdf

Bryan, thank you so much for that, wow I've got to try that, to bad I've tossed out about 10 cartridges. I've already got both the Muriatic acid and the Lye so I guess I'm pretty much set, I just have to use up my DI cartridge now.

Doug

Just a note on this. Please perform this operation in a well ventilated area. The first time you try it, it can take an hour or more. Also, when mixing chemicals with water, add the acid or base to water, not water to the acid or base. Mix gently as you add them. OK, that's the safety tip for the day!!

Thanks Brad, I figured it wouldn't be smart to do it in the furnace room so I'll do it outside under cover. The Muriatic acid container says the same thing, add to water do not add water to the acid (me thinks there must be a reason but I don't want to find out what)

Doug