Go ahead and use the metal free--remember to deduct any metal sequestrant you may have already used from the doseage that Ben prescribed. After you add the metal free, then go ahead and start using the trichlor. The trichlor will provide chlorine for the pool, and will continue to drop your pH--so test for it before you add any more acid. If you are still using bleach, stop using it at this point because you're using the trichlor pucks for chlorination. Pouring bleach into a skimmer that has trichlor in it is a VERY bad and dangerous idea.

Janet