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Ok, a lot of new replies today. If you re-read thread, maybe I was a little vague, but I did state my CYA is 60, I did get a FAS-DPD test kit, I did SLAM, and pool is no longer CLOUDY, it is now CLEAR. Some brown “dust” was in the pool yesterday (after a week away) but I brushed and vacuumed...

Here is photo of the pool. At this time I didn't realize it was starting to get cloudy. Luckily now it is no longer cloudy, but as I said above, some brown "dust" algae still appearing occasionally, so, I'll keep brushing, filtering, and keeping the chlorine a little higher.

Came back after being away for 4 days and the pool still CLEAR but developed some brown “dust” again on about half of the surfaces! Wife said the pool had faint pond smell that she identify with the algae from before. I vacuum and backwashed, hopefully that will keep it from clouding the pool...

PROBLEM SEEMS SOLVED -- I raised chlorine level to SLAM level for three nights, brushing twice a day, and the pool looks great now. It was definitely some kind of evil algae but I nuked it long and good.

So this Dusty looking pool (with dust "growing" on the walls, I now realize) probably has MUSTARD ALGAE right? There's just a very thin uniform layer of it this morning (which I've already brushed). I don't think it will show up well in a photo, is very subtle and sneaky. If I can get my hands...

Spoke with my wife and confirmed, she brushed part of the pool just a few days ago, but it had re-covered with "dust"... yeah I think this "dust" must be some kind of algae since it keeps re-appearing without any apparent cause. I am going to begin SLAM process as soon as possible. I mean, the...

No, looks more brownish. Also by the way, this “dust” seems to blanket the whole bottom of the pool... not just corners / shady spots.

Gosh I don't have a picture right now. It's a brownish color, and was easily blown around like dust, so I totally assumed it was dust (since i have to deal with AZ dust storms, dust is the only problem I have experience with so far). I'll try to take a closer look during daytime tomorrow.

Yep my FAS-DPD test kit should arrive Wednesday. If it’s algae, i have a question: I have never SLAMmed this enourmous 75k gallon pool before! Will it be OK if I use my dual SWG to create as much of the chlorine as possible? I know the troublefreepool SLAM GUIDE says not to rely on your SWG...

My wife designed and built a scary enourmous 75k gallon pool in our backyard, we opened it last June and it somehow worked very smoothly. I live in AZ so the biggest problem was dust storms, but the water has always been crystal clear, and SWG has taken care of the chlorine needs, just have to...