Just keep an eye on the CYA level and adjust your chlorine levels accordingly. (If you haven't already done so, read the Best Guess Chlorine Chart in my signature in the post above.) Don't test CYA every day or you'll run out of the reagent fast. Maybe check it every couple of weeks while you are using the pucks. If the CYA starts getting too high, you can always keep the rest of the tabs for another season. Some pools always seem to open up to no CYA so using trichlor at the beginning of the season is a good way to bring it up.