After using potash alum as a coagulant I have the impression that our sand filter is not as efficient as before anymore. Any experiences with that? Backwashing has been done of course.
JasonLion said:Normally alum will backwash out of the filter without any problems, however in some cases it can combine with other things, like suntan lotion, and form a sticky mess that needs to be manually scraped out of the filter. Instructions for using alum normally specify that you shouldn't run the filter until the alum is removed from the pool, in order to avoid this issue.
No good details on the kit on that webpage, but hopefully the cya test is a liquid one...which is good.sunrise said:Blue Devil B7770 8-way Pro OTO Test Kit for 30 $, (Same as B7448 w/ Cyanuric, Hardness, Base Demand) see here: http://www.thehottublady.com/liquid-test-kits.html. Do you know this, can you recommend this kit? I would like to measure Cyanuric.
and it turns out the pool finally went over the edge of having too much cya and not enough FC in the pool.sunrise said:But the water chemistry was no problem before.