Free Chlorine problem

[Seadog]

Hello,

I have had no real problems with my pool til this year. just opened it up 6 days ago and now the water is very clear (normal) and all the reading are
good the ph, alk, etc. the total chlorine is very high and but I keep adding more chlorine but cannot get the free chlorine to register at all on the strips.

I have bought different strips and it also register no free chlorine. any idea ?

I use the frog in-line system to deliver the chlorine and it can be touchy sometimes but it is using tablets, infact in 7 days I have been through 2 1/2
container which when running normal one will last 7 days.

inground fiberglass pool.

Thanks for any help.

[duraleigh]

Hi, Seadog,

That's an easy one. STRIPS!!! They are notoriously innaccurate and will cause you to chase problems that aren't and overlook ones that are. You need to find a good drops-based test kit so you can have an accurate idea of what you have in your pool. With that Frogger, I'd get one that tests for CTA, as well. It might be quite high.

It will be difficult for anyone to give you any meaningful advice based on the strips.

Dave S.

[waterbear]

With that Frogger, I'd get one that tests for CTA, as well. It might be quite high.

Dave S.

CTA? I've missed that one. What is it?

[mwsmith2]

Prolly a one-finger slip of CYA.

[waterbear]

yup, you're prolly right. The reference to tabs slipped right by me! (I will gladly accept any public humiliation that anyone would like to lay upon me for that one as I humble myself!)

[Seadog]

Ok on the tabs , didn't realize that they can cause problems, I am testing with the same brand as always and still no pink at all. is it possible that the chlorine level is so high it will register on the chlorine tab and just bleaching out the free chlorine tab ? can't believe it can be this clear and not have free chlorine. this inline system is called frog and you insert this plastic cylinder that cost like 18.00 and is probably a rip off.

http://www.kingtechnology.com/products/products1.htm

I will get a liquid test kit and check back.

Thanks !!

[waterbear]

First thing to do is get rid of the test strips (they just won't give you the accuracy you need to maintain your pool) and get a drop based test kit that will test for:
Free Chlorine
Total Chlorine
pH
Total Alkalinity
Calcium Hardness
Cyanuric Acid (Stablilzer or Conditioner)
There are kits available from Taylor and LaMotte that will do nicely.
The best bang for your buck will be the test kit sold on the Poolsolutions website!
http://www.poolsolutions.com/cart/ps234.php
Once you get an ACCURATE set of test results post them on here with your pool size in gallons and the finish (I know you said fiberglass) and you will get all the help you need with your pool!

Very high levels of chlorine can sometimes bleach out some chlorine tests (depends on the reagent used) I know this can happen with DPD reagent tests, I don't know if the syringaldazine reagent usually used in the test strips is prone to this, if it is it is one possible explanation of your not registering free chlorine. A DPD-FAS titraton test such as in the Taylor K-2006 or the kit sold by Poolsolutions will allow you to accurately test if the chlorine leves are very high.
I notice you mentioned the frog. Is that a PoolFrog? That is an ionizer system that uses (if my memory is right) silver and zinc ions and requires a .5 ppm FC residual. There has been some discussion on this board about them and the general consensus seemed to be to just take them out of the system and use the 3 B's --Bleach, Borax, and Baking Soda. That is what the majority of people on here seem to do and they have very few pool problems (and $ave a lot of money in the proce$$!)_