One of the equipment guys should be along shortly to help with the filter problem, but regarding the CYA, you have a few options (the first thing you need to do is find out how much you have in the water to begin with):
1) You can add straight CYA, which you can buy at WalMart, Home Depot, pool store, or other places. WalMart sells a 4 lb container of it in their spa section that I use to jump start mine when I need to. It may be labeled conditioner, stabilizer, or balancer, but if you'll look at the ingredients, you should see cyanuric or isocyanuric acid...that's what you want. Add it via old sock or nylon hose suspended in front of a return to help it dissolve....don't broadcast it over the pool like some labels describe.
2) You can use trichlor tabs in a floater to chlorinate until your CYA levels get to where you want them to be. If you do this, watch your pH because the trichlor tends to drive it downward.
3) You can use dichlor powder to chlorinate with. You can dissolve it in water and put into the pool--I would pour it in front of a return jet to help disperse it, and make sure you brush up any powder that gets to the bottom until it dissolves because you don't want it sitting on your liner. Other than adding straight CYA, this is the fastest way to raise the levels. It will lower your pH too, though, so keep an eye on it.