H2O Detective: The Case of the Mistaken Diagnosis

It was a hot day at the beginning of August and the store was finally starting to slow down a little after a long summer of extremely heavy customer volume. Harold Osborne II, A.K.A.  H2O detective, had just finished up a standard water test and the next customer came up to the test station and held over her bottle. She was a rather small lady of about 5′ tall and in her mid thirties. She was wearing squared eye glasses and had short brown hair. She had a rather smart look to her and for some reason Harold imagined her in a college library studying for an exam.

“I am at my wits end. I am hoping that you can help me out. I’ve been taking my water sample to a different pool store and I have dumped over $100 in Phosphate remover to try and get my pool to hold chlorine and get rid of the algae and nothing seems to work. The phosphates have come down some, but I can’t get completely rid of them.  I have a friend that brings her water here and she says that you guys are the best.” She said with a tone of exasperation.

“Tell your friend thanks for speaking so highly of us. I hope we can live up to the hype.” Harold started filling the sample tubes with water then reagents. By the time the reagents were dissolved there really was no need to run it though the machine, because after testing thousands of waters he knew what the results were by color. The tests were always nonetheless run through the machine and recorded into the store data base for future reference. He proceeded to type the customers information into the computer and run the test.

“It does show that there is zero chlorine in your pool, your PH is fine and your phosphate are a little high at 1300 parts per billion. How much chlorine have you been putting in and how often?” asked Harold.

“That’s exactly what I am talking about. This has been going on for over two weeks. I’ve put three treatments of phosphate remover in and I’ve been putting about two gallons of  chlorine in the pool nearly every day for the last week and about once every two days prior to that and the problem doesn’t go away. I just can’t seem to get the phosphates down low enough to have the chlorine stay in the water.” She responded, rather despondently.

“Well, in my opinion you are treating one of the potential causes rather then treating the problem itself. The phosphates are not eating the chlorine, it is actually the chlorine is spending itself oxidizing the algae. The problem is, you have 20,000 gallons of water in your pool. If everything is going great and you just need a weekly shock, two gallons is the perfect amount. You, however do not have a perfect situation. You have a mildly bad situation and you need to treat it as such. I would recommend that you put in 8 bags of shock and some Eliminator to completely wipe out the algae.” Suggested Harold.

“8 bags of shock? That sounds like a lot.” Exclaimed the customer. “Can I try less? What about the Phosphates? They are still high!”

“The problem is…” retorted Harold, “this is science, and if you do the math, less just isn’t going to give you a positive outcome. One molecule of chlorine will go and kill one algae cell, the problem is, if you don’t kill them all off, they multiple at and incredible rate. If you don’t kill them all off at one time, the money you’ve spent on half measures are a complete waste of time and money, because by the time you do your next application the algae has multiplied back to the same level you were at the day prior. It’s better to take care of the problem once and for all. As far as the phosphates go, reducing phosphates is a tool, not an end all solution to fixing a problem or preventing a new problem from occurring. There are other weapons we can use to prevent algae, rather then phosphate removers. The problem with phosphate removers are, phosphates are naturally reoccurring and you will be constantly chasing after that ‘White Whale’ with little success.”

With a look of surrender the customer agreed to take Harold’s advice. She bought her chemicals and promised to follow up with a report and another water test in three days. There is very little Harold hasn’t seen in his line of work and this was no exception. As expected he had to really sell the answer he was suggesting, because it was going against what the customer believed and was told at a different establishment. He was confident that his solution would work and she would be in a lot better frame of mind the next time he saw her.