Hi, and welcome to the forum!!

I have to say I don't know anything about your specific model of chlorinator, but can do some research online and see if I can come up with an owner's manual. Most chlorinators are set up to accept pucks up to 3-4 inches from the top of the cylinder, and most have a knob at the base of the cylinder to help control water flow.

HOWEVER............

Chlorinators are a good thing to have IF you know how to use it. Most people that use chlorinators don't realize that for every puck they dissolve in the chlorinator, they are also increasing their stabilizer. As stabilizer increases, so must your mininum chlorine level to compensate. THis is probably why you're finding yourself with frequent algae blooms. Trichlor pucks also tend to drive your pH down, which could be an issue in a plaster pool. If you would test a sample of your pool water with a drop-based kit (no strips, please!) and post your numbers here, we'd be glad to help you figure out why you're having to fight the algae. If you don't have a drop-based kit, WalMart sells a 6-way for approx. $15 that will work for now, but we really recommend the Taylor K-2006 so you can do all of your own water testing. If none of that is possible, you can always take a sample of your water to a local pool store and have it tested, but be prepared--they're going to come at you with a long (and expensive!) list of things YOU MUST BUY RIGHT NOW!! Resist that temptation....just tell them you already have it at home. Come back and post your numbers, and we'll be happy to help you out!

Janet