What -- precisely -- chlorine and alkalinity up did you use? (More and more companies are blending stuff in, with basic chemicals.)

I should explain: there's a bit of a puzzle here, based on the info you've given us, namely that you closed a non-foaming pool, and have since added ONLY chlorine and Alk-up. This is conceptually a problem, since
1. Non-foaming water doesn't start foaming on its own, and
2. No chlorine compound used in the pool trade produces foaminess, and
3. Sodium bicarbonate (alkalinity increaser) does not make water foam -- feel slippery, maybe, but not foam.

So, I'm in a bit of an awkward situation, and take your information at face value, I have to assume basic chemical laws have suddenly been re-written, though only at YOUR pool.

The only alternative I can think of, is that something is being overlooked here, and your situation is more complex than the one you've described.

Sorry if I've offended you.