Ditch the pucks. Stick with liquid chlorine for your routine chlorination needs. If you maintain your water properly (proper chlorine level according to your CYA level) and your water is clear, there is generally no reason to shock your pool (unless your combined chlorine gets over .5). The pucks will continue to add CYA to your water. What's you're current CYA level? "Ideal" level as a general consenus on this board is 30-40. It's my understanding that SWC manufacturers recommend levels higher than that once you get the SWC installed...thought I'm not sure why.