It's not so much a matter of shocking, as it is maintaining consistent, appropriate levels of chlorine. You must read the "Best Guess" page, linked in my signature, to understand what we mean . . . and why.

And you must have a method accurately testing your CYA levels, so you need a Taylor K2006 (from Amazon, since they aren't available locally). Again, there's a link in my signature.

Finally, if you have a pool cover, you must leave it off during some sunny hours, at least several times per week. The chloramines that typically form in pools are not the simple ones described in pool books or by pool dealers, but complex ones that form from the reaction of chlorine with urine or lotions. Chlorine + sunlight breaks these down much, MUCH more effectively than chlorine alone. Also, chloramines leave the pool as a gas -- and they can't do that, if the pool has a gas impermeable cover.

Good luck. We're sorry you got 'pool-stored' like so many others before you; we can't fix that, but we can help you avoid having it happen again.