IC40 not keeping up

May 18, 2018
35
South Louisiana
Cl 4
cc 0
ph 7.8
Cya 30 or 40 (it’s always hard for me to tell exactly)
CH 180
TA 90
salt 3200ish
Water temp 88
sunny, 94 air temp

Ever since spring, when the swg turned itself back on I’ve had to continue to increase the percentage output and add bleach occasionally. Raised the percentage from 80 to 85% before we left on vacation last week. Had someone check the chlorine with the R-0001 and 0002 every day and they added bleach daily because it was looking like 2 on the color scale. The reagents are new and in date and I have noticed they never seem to show correctly. Anyway, I knew I would be coming home to SLAM, but checked last night when we got in with the full dpd kit and chlorine was at 6 minus .5, so 5.5. This morning at 6 a.m. it was the same. At 11 a.m. it was at at 6 with no cc. This afternoon at 1:00 p.m., cell running at 85% it was at 4. At 4 p.m. it was still at 4, no cc. I went on and added a jug of bleach (81 oz) since the yard was mowed and some grass blew in. I haven’t checked Cl since I added bleach. So my question, is my problem solely that my cya is too low? Or could there be a problem with the ic40? The cya was 50 on June 10, after 10” of rain and I was still having to add bleach. We haven’t had much rain since but have had to add water. The TA was 70 on June 10, also, so adding water has increased my TA. Our fill is 140. I’m certainly hoping it’s not my swg because those are impossible to find now, seems like. I have put a cup of granular cya in a sock and it’s in the skimmer now. Also checked cell today and it looked good. Didn’t bubble with acid/water mixture. Cell is 3 years old.
Thank you for any advice you can give.
 
If the cell is generating chlorine, it is not the cell.
Do an Overnight Chlorine Loss Test. Raise your FC to 10 ppm using liquid chlorine and use a FAS-DPD test kit to measure FC.

If that passes and you are absolutely sure you have no algae, raise your CYA to 70 ppm.
 
  • Like
Reactions: SanibelBlue
Pentair says salt should be 3600 to 4500 with 3600 ideal. Otherwise our pools and climate are similar (South Lousisana vs Southeast Texas...Gulf coast influence.) I am running the IC40 at 40% for 10 hours a day from 10am to 8pm. CYA is at 60, though. Sunny conditions. FC holding at 6.5-7, CC 0, CH200, TA 70, pH 7.7, salt 3600. 15000 gallons.
 
  • Like
Reactions: SanibelBlue
I haven’t ever tested the salt. Just add when it tells me it’s low. I added a bag before we left in case we got a lot of rain. I can add another. In past summers 50% for 12 hours a day kept us around 7. I’m going to work on getting that cya on up and maybe it will catch up then. The pool always looks great, crystal clear unless a lot of people have been in it. Yep, gulf coast brings so much rain.
 
Be careful relying on the SWCG for salt. One of the signs of a failing thermistor in the flow switch is reporting low salt.
 
  • Like
Reactions: SanibelBlue

Enjoying this content?

Support TFP with a donation.

Give Support
Thread Status
Hello , This thread has been inactive for over 60 days. New postings here are unlikely to be seen or responded to by other members. For better visibility, consider Starting A New Thread.