Zero Chlorine readings please help!

[aylad]

How often do you add bleach? I just feel like if I am going to have to add chlorine daily, then I am still missing something. I have 2 pucks in the floater, 2 in the skimmer and the only way I saw chlorine reading was to add granular, your thoughts?

It's possible that the pucks you have are old. It's also possible that the amount of chlorine you're adding is bleaching out your test. Either way, you're having some issues with your pool, even tbough right now you have clear water, that you're going to need to address. And I hate to say it, but the trichlor pucks are the culprit with most of the problems. The trichlor is very acidic, which is going to tend to drive your pH down, causing you to constantly have to bring it up. The trichlor is also adding CYA with each puck you dissolve. Your CYA is already WAY too high, so that at the (roughly) 120 level, you're going to have to keep your chlorine level at a minimum of about 8 ppm to keep algae away, and preferably a little higher. To properly shock it, you're going to need to bring it to about 25. I would get the remaining pucks out now, and switch to bleach. (Wouldn't recommend cal-hypo either, because your calcium is on the rise, too).

How often you will need to add bleach is going to be determined at least partially by how much chlorine your pool uses in a day's time, which is affected by organic matter, swimmer load, sun exposure, etc. It's also affected by your pool's CYA level. I run my pool with a CYA level that some consider excessive--80-90--and have to dose my pool approximately twice weekly. However, I have very little organic matter and the vast majority of my bather load is continent and very good about getting out of the water to go. I also have full Louisiana humidity and sun exposure all day long, so to have a CYA less than that means daily chlorine additions. Most people run their CYA at around 40 or so.

Janet

[tamil]

Thanks for the advice! You are right I am seeing the ph drop. How long do I need to keep the cl level at 25? I have decided I am going to switch to bleach, and totally agree that I have something going on, just not sure what. I know i need to get my level up there, but not sure for how long? From this morning until now my clorine was at a 3 is now down to 1.
Thanks

[mbar]

You can have clear water, and something starting to grow in the water that is using up your chlorine. If you don't get it to shock till it holds overnight, you will battling this for a long time. Get a couple of bottles of bleach and put them in - it may take a lot. Your water is probably clear because you haven't gotten to a big algae outbreak yet. This happened to me a couple of summers ago - it took a really good shocking to get rid of whatever was trying to take hold. Use the bleach calc to see how much you need for your size pool, with your cya level