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The saga continues for anyone following. I drained and refilled pool, rebalanced chemicals, etc. Within 36 hours I’m noticing stains returning. Also noticing the color has a slight green hue. Before AA treatment and before draining, same hu. After AA, turned to blue hue. Drain and refill, back...

What do you mean? Why do I need access to the inside to loosen this?

Deep end light and niche clean. Was hoping to find a smoking gun!

@JoyfulNoise Pool is draining. Down to shallow end so far so posting pic of light fixture. Can’t imagine this is the issue given the amount of staining. Thoughts?

Some more info— now with the iron out of the walls and into the water, I got a test from pool store. 0 iron and 0 copper in the water. Guy working said he’s been getting non-zero readings all day, some even significant, so believes his equipment to be working. I called local pool water company—...

So I did the AA treatment this morning. It’s truly magic. Turns out I didn’t appreciate the extent of the staining which was indeed through the main pool but not in the spa. I’ll report back my findings in the light niches when I drain. If it’s not that— could it be the heater?

Thanks guys! Which way do I turn to loosen? Left or right?

It's a raised spa and shares same plumbing and filter...

Hi All, Does anyone have experience on tightening this union for a System 3 filter? I can’t get it to budge in any direction. Also can’t get a strap wrench in it.

What do you make of the spa being clear of staining?

@JoyfulNoise You're probably right.. but wouldn't that imply everyone around me would have iron staining issues in their pools? I haven't heard of anyone else dealing with the issue...

It fired up just fine so just going to leave it alone for now. Thanks all!

@ajw22 @Texas Splash I closed the pool with some extra bleach and that's it. Pool cover is new, no corrosion. My sense is that whatever is happening it's originating in the main pool, not the spa, since the spa opened clean and the pool opened stained. The staining appears to be a lot worse...

Hi guys, My pool has persistent iron staining. Two seasons ago I drained and acid washed. Last season I did an AA treatment and then drained. Pool was clean all summer and closed clean. I just opened the pool and found iron stains (confirmed by absorbing acid test) again. The iron stains are...