Water balance was perfect when I emptied it several days ago. Bromine, 3 step. Haven't had any issues at all, but when I drained it the disposable, micro filter was covered with dark grey silty stuff (not at all slimy) with little penetrated into the interior layers. I have done quited a lot of burning of old logs and branches several nights this past month. Water has been kept in balance the whole time. Anyway it has been about four months since last water change, or maybe longer, we haven't been using it as much as normal. Micro filter has been in at least two months. I have four regular clean cartridges. I like the filtration of the Micro Filter but may not spend the money for another one right now.
It's been sitting for about five days, mostly drained. I've had the umbrella partially shading it all those days. Three of those days it was pretty cool, mid to low 80's, and mostly cloudy and rain. Yesterday air temp finally reached 90 and today close. Past two days partly sunny, with periods of intense sunshine. Yesterday, late afternoon the humidity suddenly shot up into the 60s. It's better today, thank doGness. Should I do a fill and decontamination for a couple of hours? And should I go up all the way to decontamination FC like when treating for bio-slime. I haven't had any bio-slime since I HYPER Decontaminated it months ago. I really don't mind doing that and it's only 550 gallons of water.