Buh

I'll be damned. I've spent the last hour reading your post, then re-reading, and reading more. When I thought I had it, I read it again. I've had training by many different chemical companies over the years - they all say the same thing. YOU are the first to show proof of what REALLY happens. I'll read this again tomorrow. Thank you for your invaluable information and taking the time to educate me. Chem geek, thank you as well - all the pieces have come together now.

We are talking about copper stains. Adjusted pH is the number given depending on how many base or acid drops are required - thus the system can calculate how much of what product to add. This calculation is determined by our program - The Prof2 created by Sani-Marc. I reported 3 to 7ppm of what? The original CYA reading of 100ppm was taken with a clear pool, the 60ppm was taken with a cloudy pool. The pH down was used to lower the alkalinity. This DOES make sense. The pH up was used to bring the pH up. We are using a dry acid, and we both know this is how alkalinity and pH are adjusted. I'm not sure why this seems to be mind boggling. I will agree timing might have been to close together with the additions. The phenol test allows for 10 drops base or acid depending which way you're going. It is possible to add the max with no apparent color change. You know this - so am I not understanding what you're trying to say?! I'm using the TLK204 Wise Lab. I've been using the lab for over 6 years. I'm all for learning more, but I can say I'm quite comfortable with using this lab. The products used were: http://www.lawrasons.com/POOLSPA/spotlight/index2.html The Stain Out and Stain Prevent. The salt cell has been confirmed in need of replacement. The cell is 5 years old. I understand the demand on chlorine during the process. This pool has been on our radar for sometime - we are quite familiar with it. The clients have not taken care of the water chemistry ever. You are NOT dealing with someone new in dealing with this process, nor chemical application. I didn't come here to get flamed or insulted. Nothing mentioned above is considered 'strange' by means of assuming I have no idea what I'm doing. I know this is beyond 'weird' and near impossible to achieve. I'm not convinced the calcium level is at '0'. This morning a sample was taken again supporting 0ppm calcium. I've never come across anything remotely like this that would lead to a test malfunction to cause the calcium to 'hide' with no signs of a kick out etc. The removal process was completed Tuesday afternoon. Nothing was done on Wednesday due to time restraints. Thursday a new sample was tested showing 270ppm calcium. Friday, 3 samples were taken tested multiple times showing 0ppm calcium. Saturday morning another sample was tested, still showing 0ppm in calcium. The pool is clear.

Hello all, I'm dealing with a staining issue in a fiberglas inground swimming pool. The removal process has been completed, and now I'm left with a blue cloudy pool. Clearing this up will be easy enough. So far everything has gone as planned (I've done this many times over the years) with the exception of 're-balance' day. The lab results (Taylor lab) show something I've never seen before. Here are the results leading up to my confusion. AFTER stain treatment: Salt: 2800ppm F. Chl: 0ppm T. Chl: 0ppm pH: 7.0 (adjusted 6.3) Alk: 140ppm (adjusted 133) Stabilizer (CYA): 100ppm (true value) C.H.: 270ppm 24 hours later the stain removal process was completed - vacuum and backwash etc. 4 hours later the re-balance process began. pH down was added, followed by pH up 4 hours later (40,000L pool). The salt system decided to fail and chlorine tablets were placed in the skimmer. A shock was NOT used. A clarifier was also added. Today, 24 hours later the test results show: Salt: 2700ppm F. Chl: 0.6ppm T. Chl: 1.8ppm pH: 7.0 (adjusted 6.2) Alk: 130ppm (adjusted 127) Stabilizer (CYA): 60ppm C.H.: 0ppm The CYA dropped and the calcium disappeared. Two water analysis were done to confirm this by several people. After all this rambling, my end question is this: Can anyone shed any possibilities as to how this may have happened? I find this very odd and can think of no scenerio to explain this. Thank you for any input you have to offer. Canadian Buh