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

[barma16]

Thanks - +/-20k tallies with my rough calculations based on measurements too, so I'll stick with that as a working number. Pool is now clear of all leaves, and the water looks crystal clear to me, but I'm still losing 2ppm overnight. Last night I was at 16ppm, and this morning I was at 14, so 12.5% loss. The night before was approximately the same (I don't have my numbers in front of me). The filter still needs backwashing every day or two, so there's clearly still something in there that's not visible to the naked eye.

Given that I'm still backwashing fairly regularly, and therefore replenishing water from time to time, would it make sense to leave the CYA until the filter runs for rather longer, instead of diluting it when I top the water up?

At 12.5% overnight loss in an unstabilized pool, can I start letting the level drift down yet?

Thanks as always...!

[BigDave]

If I were in your situation, I'd maintain shock level until you measure less than 1ppm drop over night plus one more day for good measure. After that , I'd let it drift down. After the FC is down to normal - high normal, I'd add half the calculated amount of CYA and retest CYA in 5 days and 7 days. If both readings are the same, add more if needed - wait and test - CYA disolves very slowly and overshooting the goal makes new problems. Maintain FC level using bleach or liquid chlorine.

[Yeggim]

Given that I'm still backwashing fairly regularly, and therefore replenishing water from time to time, would it make sense to leave the CYA until the filter runs for rather longer, instead of diluting it when I top the water up?

Sounds like a plan.

At 12.5% overnight loss in an unstabilized pool, can I start letting the level drift down yet?

Thanks as always...!

Sometimes the testing times will influence that overnight loss number. With low CYA, testing a little too late after sunrise or a little too early before sundown might account for that extra 1ppm. What's your CC numbers?

[barma16]

Sometimes the testing times will influence that overnight loss number. With low CYA, testing a little too late after sunrise or a little too early before sundown might account for that extra 1ppm. What's your CC numbers?

Interesting you should say that - I was worried about going too far the other way. I'm testing at 10pm, so the sun is well down, and 6am (which, frankly, is a pain) so that the sun hasn't been up too long. Up at 6 again tomorrow - will post CC numbers then...

[Watermom]

As long as you test within two hours of sunrise, it is fine.

[barma16]

Apparently no change overnight. 13.5ppm last night, 13.5ppm this morning. 1ppm CC. This seems a little too good to be true, but I tested twice this morning and got the same result. I'm working on a 10ml sample though, so perhaps there's less than 0.5ppm lost... Either that, or my testing is suspect again

I guess we'll have to see what happens tonight...

[Watermom]

Good news on the chlorine levels overnight! Since you still have CC of 1, keep it at shock level again today. Just use the 10ml sample. No reason to waste the reagents and 0.5ppm accuracy is close enough.

[Yeggim]

Excellent news except for that CC reading. I'd give the entire pool a good brushing, especially the corners and the walls. Afterwards I'd jack that baby up to 20ppm Chlorine. It could be the knockout punch of this epic battle.

I think you're way ahead on the scorecard but I don't trust that judge from Algaeria. You've really done an outstanding job thus far.

[barma16]

I think I can finally claim victory - three nights in succession with no FC loss. CC tested today with a 25ml sample is 0.2ppm or less - one drop cleared the solution. The filter has run for three days straight without gaining more than a couple psi.

So... I'll let the CL drop down to 6 or so, check and adjust pH, and then add some CYA. Back on page 1, when I thought I had 40k gallons, 6lb of CYA was recommended. Now that I know I'm actually around 20k gallons, I assume I should add about 3lb? I guess once I get all my levels within the ranges here: http://poolsolutions.com/gd/poolsolu...try-guide.html then I'm good to go?