My friend, who owns the TF-100 kit had water go from crystal clear to cloudy to the start of an algae bloom. Perfect chemicals and he brushes at least 2X weekly, almost every 3 days. I stopped by and the pump basket was full of leaves (slowing down some circulation). The pool only operates on one return, skimmer and main drain (return in shallow end). The culprit was the pull out stairs (old pool) where algae was lurking behind. We quickly removed the steps, ladder and leaves.
He started the SLAM, but comes to me for advice. After he started the SLAM, I received a phone call, and with 5 ml of water, he counted 22 drops (OK, his level is 22, but that did not make sense as we only add 2 gallons of 12.5% in a 20K pool to bring up to shock level). He also said that he did the test with 10 ml of water and the count was 26, therefore his level was 13. That sounded pretty accurate. I know that at 25 ml, vs. 10 ml, vs. 5 ml, when I have tested in the past, my levels were almost identical. I took my time with the drops and there was slight variation.
Question: Outside the consistency of the drops, why such a variation? This is a 7-8 ppm difference. What could have happened? I know my 5 ml vs. 10 ml testing is not that far off (maybe by 1 ppm) so I do not put too much emphasis. Even with other friends, who took 3 weeks to clear up a pool based on bad advice and used 5 ml sample did not have this type of margin error, based on liquid chlorine additions. Thanks!
He started the SLAM, but comes to me for advice. After he started the SLAM, I received a phone call, and with 5 ml of water, he counted 22 drops (OK, his level is 22, but that did not make sense as we only add 2 gallons of 12.5% in a 20K pool to bring up to shock level). He also said that he did the test with 10 ml of water and the count was 26, therefore his level was 13. That sounded pretty accurate. I know that at 25 ml, vs. 10 ml, vs. 5 ml, when I have tested in the past, my levels were almost identical. I took my time with the drops and there was slight variation.
Question: Outside the consistency of the drops, why such a variation? This is a 7-8 ppm difference. What could have happened? I know my 5 ml vs. 10 ml testing is not that far off (maybe by 1 ppm) so I do not put too much emphasis. Even with other friends, who took 3 weeks to clear up a pool based on bad advice and used 5 ml sample did not have this type of margin error, based on liquid chlorine additions. Thanks!
