Honestly somewhat confused after reading through all of these good threads.

I have a new in-ground vinyl lined, with dealer installed in-line chlorine feeder. Started the pool late last season with 3" tri-clor pucks. All seemed well except for constant low PH, which now I learned may be due to the stabilizer. Did not have a good way to check CYA levels, which were most likey high.

So, I need help on how to best start up this year and try to keep the vinyl liner in good shape as well. Can I use un-stabilzed chlorine (like Poollife's product) in the feeder? Should I stick with the tri-clor method? I am afraid to use liquid bleach with the dark vinyl liner.

Also, what is the best product to use to shock the vinyl pool and how often? Dealers tell me to buy the non-clorine shock.

Very confused here and could use some of your expert advice on these topics. Thanks in advance.