At Wits End wrote:Here are the vital stats:
Saturation Index: 0.2
TDS: 2200 (down from 3500 after draining half the pool twice)
Total Chlorine: 1.1
Free Chlorine: 0
Total Alkalinity: 148
Adj. Total Alk: 127
Total Hardness: 308
Each time we go the the pool store, they keep telling us we are so close, so we have added bag after bag of shock, but like I said, there's no chlorine after 5-10 minutes. We finally put chlorine pucks in the skimmer baskets, which they think is the result of the 1.1 total chlorine.
Thanks so much.
A few thoughts on your pool. With a CYA level of 70 to "shock" your pool you need to hit about 28ppm FC. Sounds like you aren't getting close to that level so the chlorine you do add is used up quickly. I would guess you have the beginnings of algae and then is taking out your chlorine.
The tablets you put in the skimmer will add to your CYA and make the FC level you need to "shock" even higher. Do you know what type of chlorine the bags of "shock" you are using are? If it's dichlor you're adding even more CYA.
To bring the FC level up to 28ppm you will have to add a lot of chlorine all at once (see http://www.poolcalculator.com/
to determine how much you need to add to your pool). Another problem here is you need to be able to measure chlorine levels that high. Most test kits or strips can't do that. There are kits that do and unless your pool store is able to test those levels for you, you might want to invest in one.
There may be something going on in your pool I"m not thinking of that is using up the chlorine that quickly. I would assume algae though and treat accordingly. Throwing in bags of "shock" will often clear a pool but you really need to know what it is adding along with the chlorine and how much is needed to get the job done.
I know I didn't give you a flat out answer to your problem. Don't think I can without being there to see and test the pool. Experience does tell me that with CYA of that level algae is always close by because maintaining the right level of FC generally isn't done. We look at the test kit and read a level of "OK" and think we're fine but it really isn't unless you are basing that FC level on your CYA level.
One last thing, tablets in the skimmer is almost never a good idea. If you run your equipment 24/7 you might be ok but if you turn it off and on and have a heater bad things can happen. The tablets have a low pH.