Sorry the subject lines a bit cryptic, but I'd like the brains truss to
tell me what's going on here.

My plastic water bottle, which is refilled regularly with tap water, was
suffering a bit od green algae, so I put some of the above crystals in, and
a bout 1/3 filled with hot tap water, put the cap on and gavre it a shake,
and it foamed up like Andrews.

I expected a pressure buildup, and was ready to ease the cap, but the
opposite happened, and the bottle was squashed nearly flat by air pressure,
and developed a permanent dimple in the bottom, so some serious vacuum was
being formed.

But how? - it's alleged to have 15-30% oxygen based bleaching agent, and
5% non-ionic surfactants, 5% anionic surfactants,(whatever all those are)

It does a good job on the algae.

mike