Ph and alkalinity imbalance

[ajw22]

View attachment 169915
Any ideas on the black spots in the deep end? I have tried fine scotch Brite, magic erasers and they won’t do anything.
Would you recommend the test kit from Jack’s magic to see if anything is going on? Thanks. Should I start a new thread for this?

Let's ask @Texas Splash about the black spots now that we have your water chemistry on the right track. Pat has experience with FG pools.

 

[mknauss]

The spots appear odd for iron, but the test is easy and cheap.
Crush up a handful of vitamin C tablets in a thin sock. Set them on the spots (use your brush or net). If iron, they should lighten or possible disappear in a few minutes.

 

[ShrinerManSC]

The spots appear odd for iron, but the test is easy and cheap.
Crush up a handful of vitamin C tablets in a thin sock. Set them on the spots (use your brush or net). If iron, they should lighten or possible disappear in a few minutes.

Thanks. I’ll give it a try.

 

[ShrinerManSC]

Thanks. I’ll give it a try.

The spots appear odd for iron, but the test is easy and cheap.
Crush up a handful of vitamin C tablets in a thin sock. Set them on the spots (use your brush or net). If iron, they should lighten or possible disappear in a few minutes.

Thanks for the suggestion. I put it in a old nylon stocking and held it For about 10 minutes. It is still there.

 

[Texas Splash]

Since Vitamin C didn't work, maybe try some dry acid in a thin sock? If that works, it's copper.

 

[ShrinerManSC]

Since Vitamin C didn't work, maybe try some dry acid in a thin sock? If that works, it's copper.

Thanks. I’ll get some and try it and advise the results.

 

[AUSpool]

Back at the start you said your salt is at 300ppm. That seems very low to me. I would check it again, look up your SWG’s requirements and adjust as needed.

 

[ShrinerManSC]

Back at the start you said your salt is at 300ppm. That seems very low to me. I would check it again, look up your SWG’s requirements and adjust as needed.

That was a typo. 3000ppm. Sorry.

 

[ShrinerManSC]

Thanks. I’ll get some and try it and advise the results.

Since Vitamin C didn't work, maybe try some dry acid in a thin sock? If that works, it's copper.

Since Vitamin C didn't work, maybe try some dry acid in a thin sock? If that works, it's copper.

Hello. I got the dry acid and held it on one of the areas for 10 minutes. No change. Should I order the Jack’s Magic test kit?

 

[Texas Splash]

Should I order the Jack’s Magic test kit?

At this point it's worth a try. On occasion the ID kit confirms something the DIY tests simply don't catch.

 

[ShrinerManSC]

At this point it's worth a try. On occasion the ID kit confirms something the DIY tests simply don't catch.

Thanks. I’ll get it ordered.