Ditch the Pool Frog. I am copying and pasting below (the part in bold print) a post Ben wrote about the Pool Frog:
Pool Frog per Ben:
The Pool Frog is one of a class of devices that put copper (and sometimes silver) into pool water.
Copper:
+ kills algae
+ inhibits some bacterial growth
BUT ALSO
- does NOT inactivate viruses
- does NOT kill bacteria quickly enough to protect people
- does stain pool walls
- does turn hair green
- is NOT 'natural' -- it's in the toxic 'heavy metal' class, if you want to play chemical name games.
- is NOT 'chemical free' -- copper ions are just as 'chemical' as hypochorite (chlorine) ions.
You don't need it. You are better off just using chlorine. Many of us just use plain, unscented 6% bleach for our chlorine. (Generic Walmart brand is fine.)
Since you are getting a CC reading of 1, you need to shock your pool. With a CYA reading of 50, your shock level would be around 15ppm. (See the Best Guess Chlorine Chart in my signature for more about that.) Your pool is about the same size as mine. Each of the big jugs of bleach from Walmart (1.42 gallons) will add about 4.5ppm of chlorine. Use that as a reference to help you figure out doses. You'll want to test in the evening when the sun is off the pool and add enough bleach to get back to 15ppm. Then, an hour later, test again. And, then, once more in the morning within 2 hours of sunrise. See how much chlorine you lose overnight. You need to keep they chlorine at shock level until you can go overnight without losing more than 1ppm of chlorine and you have a CC reading no greater than 0.5. Then, we usually say keep it high one more day for added insurance and then let it drift down. But, you will want to make sure it ALWAYS stays between 3-6ppm.
Your pH of 6.8 may be a critical problem. Since the test block can't differentiate a reading any lower than 6.8, getting that reading means it may actually be much lower. Add a box of Borax slowly to the skimmer while the pump is running. After 2 or 3 hours, retest and redose until you get the pH up to 7.4-7.6 although actually anywhere 7.2-7.8 is ok. A reading lower than 7.0 is acidic and can cause damage to your pool.
Hope this helps.
(By the way, use the 10mL sample instead of the 25mL sample to save on your reagents. Also, it is not necessary to run the CYA test every day, nor the TA. Just FC, CC, and pH.)
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