Chlorine Demand

[gfritz1]

I initially filled out the pool chart a few weeks ago. Is it not saved?

[Watermom]

Yep! It's there. Sometimes we forget that we have already asked somebody to fill it out with all the people we help each day!

With a CYA of 80, you need to be keeping your FC between 5-10 all the time. Losing 2-3ppm of FC in a day is very normal. In a 23,000 gallon pool, each gallon of 6% bleach will add about 2.5ppm of chlorine.

If you want to shock the pool to try and make sure the filter is clear of any goo, your shock level would be 20ppm. So, use the reference I gave you above to figure out how much bleach to add when you test to take it up to 20. If you can go from sundown one evening to within two hours of sunrise the next morning without losing more than 1ppm of chlorine, have a CC reading no higher than 0.5ppm and have clear water, then you are good to go and can let the cl drift back down to 5-10.

Hope this information helps.

[gfritz1]

I did the 20 ppm about a week ago from sunset to sundown but for sure lost more than 1 ppm so what does that mean? I have been able to hold a FC reading above 5 ppm the last week but until yesterday had been losing 2-3 ppm . Im away again so had my brother in law check pool the night before and it was at 3 ppm so he added like 5 quarts of bleach at sunset and let pump on. Last night was still 7 ppm so will check tonight. question with much time away am I overall better looking at SWG or do all teh same issue stay the same with checking daily etc? Thanks

[PoolDoc]

I initially filled out the pool chart a few weeks ago. Is it not saved?

I'm working on a plan to convert some of the data in the Pool Chart into signatures that will show up each time you post, but right now, it's just a plan. We have to do a search on the pool data, which is getting to be rather large set!

[Watermom]

With a CYA of 80, if you let your chlorine drop below 5, I'd suggest shocking the pool. It doesn't take long for something to get started in the water.

[gfritz1]

Update and a few questions - Reading tonight as it has been holding well since did the drain and 8.5 gal bleach . Tonight PH 7.8 FC 3.6 CC 0 TC 3.6 ALK 140 HARDNESS 140 CYA around 60 All tested with Taylor kit. So what do I add under BBB to raise hardness or domt you worry aboyut it at this level? Would you do anything to adjust AlK a little or leave ? I am using between 3 qt and a gal of bleach a day to keep FC above 5 . Is this normal as at this rate the bleach is about $1.60/day or $48/month ? Would a SWG be less expense to operate ?Water has been excellent

[Watermom]

Where do you live? Some pools in places with really hot climates do better with CYA a little higher.

In a vinyl pool, you do not need to worry about calcium hardness.

Your TA is fine where it is.

An SWCG is a very costly unit. It would take a long time to recoup your cost as opposed to just using bleach, but some people really do like having them.

[gfritz1]

Live in Northwestern PA above State College . My CYA has been between 50 and 80 . At the pool store with strips it looked like 100 yesterday .But using Taylor kit I ended up between 60-70

Thanks

[Watermom]

Trust the Taylor kit's results.

I wouldn't think that in your area you would need CYA higher than 60-70. People who we sometimes suggest that to are those living in the really hot areas of the south. I think you're probably fine with 60-70. However, if you want to bump your CYA up some, you can but if you do so, you'll need to run higher chlorine levels per the Best Guess Chlorine Chart.