Moderator comment: This post was separated out from another thread:
I assume it's just acid to drop the PH down to ??? 7.2ish? And then aerate like crazy (in addition to the SPA spill over I have waterfalls I can turn on to help aerate)? Let the PH get back up to?? 7.8 and drop back to 7.2? Later, rinse, repeat until the PH quits moving?
Any risk of going too low on the TA (like 0?)?? And still seeing PH rise? Is there some 'safe' minimum I should give up the experiment at not to cause serious trouble in the pool?