Inherited a pond, trying to turn it into a pool!

[barma16]

OK, forget the Turbo Shock...

I added 5gal 12.5% and was at 11.4ppm FC after an hour. Added another 3gal, and an hour later the count had shot up to 27.5ppm. Is it reasonable to assume that the first 5gal hadn't fully dissipated by the time of the first test? I reviewed and followed the Taylor video, so I'm pretty sure I'm testing correctly now.

I can see a marked improvement in the color already - it's definitely lightening. I'm letting the levels calm down a bit now (just tested and still have 25.5ppm after another hour). I guess that at these levels I don't want to be adding any CYA yet?

[Watermom]

Wait on the CYA. You probably don't want to go quite so high with your chlorine since it is a vinyl liner. I'd probably go 15, 20 max.

if you have cal-hypo on hand, it is fine to use that for awhile since your calcium level is low at 70. But not for too long. High calcium can cause cloudy water issues. I probably wouldn't let it go higher than 200-300. Then just bleach or liquid chlorine. Or else, just forget the cal-hypo and stick with bleach. From your last post, you seem to be making some head way.

[barma16]

Thanks - getting that high was accidental. My second dose was based on the results an hour after the first, but I don't think the initial dose was fully dissipated by the time I added the second. I'm down below 20 again now (19 when tested on the hour); and planning to stay below. I just have bleach at this point, but it seems to be doing the job

[Watermom]

It will do the job if you consistently maintain shock level. Keep us posted .......

[barma16]

Consumption, if that's the right term, is slowing - only lost 0.5ppm in the last hour. There's less sun at this time, which I expect makes a difference. I've been wondering about volume all day - the 40-45kgal I quoted in my first post was the contractor's best guess, and seems high to me.

I've been crunching numbers since, and I don't think there's more than 35kgal in there. The pool is L-shaped; 44' long by 16.5' wide with an additional 6' at the bottom part of the "L". It's 3' deep along the shallow first 19', dropping to 8' deep at the deep end. The corners are all cut.

I also reckon 1gal 12.5% is adding about 3.4ppm based on measurements. If 1gal of the 12.5% should add 2.8ppm to 45kgal, then 3.4ppm/gal means 35k is in the ballpark. Seem reasonable?

Here's how it looked at 12:00, in case the visual helps make sense of my ramblings...

Sunday 1200.jpg