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maybe this shows it a bit clearer, the bottom has some areas that are distinctly grey, with others that are a much brighter white.

Plus what it looks like with water:

Hey guys, I had the pool half drained over the weekend (was exchanging water to get rid of iron from bad salt) and got a chance to look at what the surface looked like dry. Since we have owned the house the pool has always had a mix of white and grey mottling. From my reading I assume it is...

This is the step back in 2020

Hi James, I've never used a metal based algaecide in it but the pool was 2yrs old when we bought the house, I do remember there being a bottle of algaecide left in the pump enclosure. The original color is a good question, it's white with a blue and white quartz speckle by the looks of...

Nope just a swcg

Sorry ascorbic, pure vitamin c powder

Yes pure powder, have made the mistake of using orange vitc tablets in the past. They don't really brush away but do lighten a bit, running the pump now to see if they lighten up. I was thinking copper but the brownness of the stain as opposed to grey put me off. It hasn't had any copper since...

Hi folks, Trying to figure out some stains in the pool, I chucked some acetic acid in some skimmer socks and put them on the stained area in the deep end of the pool. 5 minutes later I notice something very strange, there is a streak of brown coming from where the socks are. Any ideas what...

Beginning to think that some of my stains (the ones I tested with vit c) were iron, maybe these ones aren't. Possibly could be copper, I've never added any to the pool but the previous owner did leave behind a half used bottle of the cheapest algaecide he could find...

Doing an 'opportunity' based AA treatment. By that I mean the pool pump was left off by accident, fc dropped to zero and I was lucky enough to catch it before algae. My stains appear to be iron from vitamin c tablet test. But here's the thing. My pool is only 20K litres, and I've dosed 750g of...

Every 4 hours or so definitely sounds like something growing. Mine was only coming back over the course of a few days. Also i wasnt getting any of the white milky dead algae that you are seeing. The bucket test didn't grow any algae or dust. But passing two OCLT tests and crystal clear water...

Passed OCLT test again!

Well yesterday I pass the OCLT. In fact it went up 0.5ppm overnight, but at 40 drops for 20ppm that's probably within the margin of error. Let the chlorine come back down today. Brushed the pool and there is a fine layer of brown coming up, but honestly I suspect it is fine dust. Doing another...

Hi Guys, Currently Slamming my pool which is normally SWCG. Due to highish cya the slam target is up hugh (was 28, replaced some water to drop cya to target 24) At the high FC numbers (24+) my titration test turns orangey/Brown at the last drop. More drops do nothing to change the color. Any...

I think I have been going to far with cya test. I just put the 50CYA standard in the tube to the 50 line. I can see way more of the little chem flask than I expected! Going to do a backflush, top up and then retest CYA.

Hi Ted, thanks for the advice. I do have one place I can't get into to clean which is that 1 blocked return line from my post a month ago or so. Its still blocked as the pool was circulating well without it and I haven't had a chance to try again clearing it. I don't test the FC after every...

Almost at my wits end! Another 5 days down and still not quite passing the OCLT! I will give the filter a backlash today, but it's pressure rise is only 1psi off clean.

Well mp4 can't be uploaded so here are some screenshots!

Ok so o thought my SLAM was almost complete.... but maybe not. Water has been clean the entire time, bottom & step looked to be staying clean too. OCLT was 1.5 last night, I didn't top up this morning as i wanted to try the OCLT tonight at lower FC due to the accuracy at high fc. Got home...