An SWCG is just a chlorine dispenser, and won't solve any problems you couldn't solve without it. It does make it easier to chlorinate consistently, but a pool with an SWCG will get just as green as one without it, if you don't maintain the system.

As in almost all cases, you need to get a Taylor testkit, and you need to learn to test and treat your pool with basic chemicals. If you'll read the test kit info page linked in my blue signature block, there's a link to a Canadian retailer for Taylor kits.

And, if you'll complete the Pool Chart, we'll be able to advise you more accurately:
Pool Chart Entry Form