Pucks

[Sherra]

Tri-chlor & di-chlor both have stabilizer. The difference is tri-chlor also has a "clarifier"

[RocKKer]

My understanding is -
Di-chlor has Chlorine and CYA
Tri-chlor has Chlorine, CYA and Acid

[waterbear]

Dichlor and trichlor are both stabilzied chlorine (chlorinated isocyanurates). Trichlor has a pH of around 2 while dichlor has a pH of around 6 so both are acidic. Trichlor is slow dissolving so it is suitable for forming into tablets for use in erosion feeders. Dichlor is very fast dissolving so it is sold in granular form and is not really suitable for use in erosion feeders.
Dichlor adds more CYA to the water than trichlor. For every 1 ppm of FC added dichlor will add .9 ppm of CYA while trichlor will add .6 ppm.
Hope this helps.

Edit: some companies will include other ingredients such as copper sulfate as an algae preventative, clarifiers, sodium tetraborate (borax) as a pH buffer, etc. into their formulations of these products but these have nothing to do with whether it's trichlor or dichlor. Also, the number of chlorine molecules attacted to the cyanuate structure determine if its dichlor or trichlor. Dichlor has two and trichlor has three. This is why dichlor puts more stabilizer in the water then trichlor for a given amount of chlorine. There is one third more chlorine in trichlor than in dichlor.

[CarlD]

Tri-chlor & di-chlor both have stabilizer. The difference is tri-chlor also has a "clarifier"

Sorry, this is just plain wrong. See Waterbear's explanation.

Tri-chlor and Di-chlor have stablizer because that's part of the chemistry that makes them. And when they release their chlorine, they release the CYA too (stabilizer).

If your CYA is high, using Tri-chlor while you are away will send it through the roof.

When I'm away, I have someone dump 1 gallon of bleach in the skimmer every other day and that's all I need. I have the pump on a timer, and leave the solar cover on. So all my father-in-law has to do is dump in the bleach every other day.

[NWMNMom]

I knew someone would show up with the right explaination! Thanks.

[Sherra]

Sorry, this is just plain wrong.

That's what I always thought. As my mom used to say...That's what I get for thinking! It didn't even dawn on me to think about the di & tri chemically.

[day1]

Actually saw some cal hypo pucks at wal mart neighborhood store. I'm thinking of using these when I go away on vacation.

[chem geek]

Every 1 ppm Free Chlorine (FC) you add from Cal-Hypo will increase your Calcium Hardness (CH) by 0.7 ppm, but that's not usually a problem and represents a much smaller percentage increase in typical CH levels (i.e. the 0.6 ppm increase in CYA from Trichlor out of 30 ppm CYA is 2% while the 0.7 ppm increase in CH from Cal-Hypo out of 300 ppm CH is 0.2% or one-tenth as much).

Richard

[ctwine]

There is another Cal-Hypo 3-inch puck available under the Sustain name. I travel frequently and use this product for my daily chlorine use. I do use bleach to shock but find this puck helps me maintain my chlorine level while I'm away. The puck is not wrapped in plastic and does not erode in a day or two. Every bucket comes with a plastic dispenser and a sliding lid. It holds two pucks, which usually last approximately one week. Sustain also makes other products for shock, clarifying, etc. but I don't use any of them. I'm a BBB kind of guy who uses these pucks to maintain my chlorine without stabilizer. They have a website at www.askjoepool.com if you want to locate a dealer near you. I'm not in the pool business! I live in CT and my login name should give away what biz I am in! Cheers!