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Just want to update everyone that I have been able to add 24oz of 10% bleach each night to raise my FC from 5 to ~ 6.5-7, then drop back to 5 after a full day AZ sun. I want to be on the safe side to make sure my FC stays above 4 (my CYA 45-50, I saw my pool generated CC when FC dropped below...

I just did a post about my pool under AZ full sun :) . My CYA is 45-50. My FC will drop to 5 when I measure after sunset, then I add 24 oz of 10% bleach to raise it to ~ 7, the OCLT is 0 (i.e. still ~ 7 in the morning), and then my FC drops back to 5 after a full day. Your FC is definitely too...

Thanks!

Thanks for sharing! As mentioned above, now I feel that FC loss depends on the starting FC level in the morning and its ratio to CYA. Maybe CYA level itself is not so critical. When I have chance, I will test a low CYA level to see if it will match your experience.

Thanks for sharing. I just finished the tests today. My FC last night was 5. After adding 32 oz 10% bleach, it was 6.5 this morning. And it was 5 tonight. I am getting the same range as you have. I think last time my FC dropped from 6.5 to 2 during the day could be due to the windy day with...

Now I see by just replying a post, the post will be quoted. To "Tres Gatos", it is amazing that you can have a 1-2 ppm loss of FC. Bullhead city is as hot as Phoenix during the day, but cooler during the night. I am wondering if you have a low CYA level, or just because your water temp could...

Last post is for mknauss. I wanted to quote the post, but it didn't work :-(. Agree with sbcpool.

Maybe that's because you have a SWG, which needs a minimum CYA of 70? I have a non-SWG pool, and my CYA could go down to 30.

Thanks for all your replies! It is pretty normal then. I tested today again. It is a (8-5)=3ppm. I guess if the starting FC is low, the loss will be less. Seems a lower CYA could have some advantage since it allows an overall low FC. Will test it.

Hi, everyone After following instructions from TFP, I finally have a clean nice pool with balanced water: TA 85, CH 350, CYA 45-50. My overnight FC lost is always 0 now. One thing bothers me is the consumption of the FC during the day with the AZ sun. My recent measurement showed FC loss of...

Chris and Dave, thank you for your inputs! That makes me much comfortable about pH measurement. I will wait FC to go down and then test the pH using color. Regarding waiting and solution will turn red, will this affect the CC measurement, e.g. after adding R0003, the solution will turn red not...

Thanks for all your replies! I will do the test quick without wait then. I was SLAMing the pool and my pool's CYA is high (60 ppm). That's why FC level was so high a few days after SLAMing. I used 10 ml sample, and the drops (>36) made the volume higher. I will calibrate the pH meter. The...

Thanks for both your replies! I used right chemical, but last photo may have 0003 in it. I tried again tonight without any 0003. I saw a problem of color changing from clear to pink if I waited sometime. Here are some photos: 1) just 0870, 2) 30 drops 0871, 3) 36 drops (clear), 4) wait 1 min...

I just received my tftestkit-100, and measured free chlorine level. I expected to see water change back to clear after I added the last chemical, but the color still changed from red to a dark hue clear at drop 50, and remained that way at drop 60. Will the solution ever go to completely clear...

I am a pool owner for 5 years. It is not easy to get all chemistry right, so I used two companies to maintain my pool. However, they just came once a week for a very short time, and I feel I still need to do work myself. After seeing algae growth last month, I stopped the service of the 2nd...