Sequestration or Chelation??

[mbar]

I have used both sequasol and metal free. They are both good, so it doesn't matter which you use. I would add a good dose right after your fill - a little more than the bottle says. You will not have to do anything else when you close. I have already closed with stains and opened to a stain free pool - I don't know why, I can only guess, so don't worry about adding any sequesterer when you close. I would save the chemicals for next year when you open. Next year when you open, before putting anything else in the water add the sequesterer. This way any metals the were introduced over the winter or with your fill water will be taken care of. Then you only need to add it if you see any stain starting to form. If you see stain start, take your ph down to 7 - 7.2 and add sequesterer - it should lift the stains before they settle. Feel free to ask any questions you have

[Jakebear]

WOW --- this is great information and I do (almost) understand it.

Evan -- I've learned more chemistry since looking at this forum than I did at Brevard Engineering College (now FIT) in Melbourne back in the 60s.

Marie -- Keep the info coming about Metal Magic --- I'd just as soon have it settle so the robot can gobble it up and I can get rid of it. I do add quite a bit of water from the well so I guess the chelator or sequestrant will be a regular around here.

The free Cl has nearly quit dropping (2.8ppm) so I'm still waiting to add the Ascorbic Acid. Since the CYA is ~50 it could take a while based on Richard's half life explanations. Might have to add some sodium thiosulphate to lower it the rest of the way (Target = 1-2ppm)

Marie --- I'll have to look you up next time I make the run from Mahanoy to Shamokin. With all that coal leeche no wonder you get stains. Do you have to fight low pH too?

[mbar]

Mahanoy to Shamokin!!! We are neighbors Yep, the coal regions. I used to fight low ph, but this year for some reason my ph keeps rising It may be because it has been dry and I haven't used many trichlor pucks this year. I used to use them to keep the ph low so I wouldn't get stains. This year I didn't have any problem with stains so I have been just using bleach. I didn't check it today, but it probably is low from all the rain. What town are you from?