FC loss

[loonyredhead]

9 am test results:

FC 3
cc 0
ph 7.4
TA 100
ch 125
cya 30

4:45 test results:

FC .5
cc .5
ph 7.4
TA 100
ch 125
cya 30

I checked overnight loss last two nights and it has been 0. How should I proceed to keep my FC levels around 4 and not get to 0 before the end of the day? Full sun, 105 temps, swimmer load (6 kids, averaging 4-6 hours a day).

 

[Texas Splash]

As long as you are algae-free, which it sounds like you are because you passed the OCLT and have less than 0.5 CC (clear water too right?), then increase your CYA. It must be hot there in V-ville, so I would increase CYA to at least 50. But make sure to increase your FC along with it - target FC of 6 and NEVER below 4. Your FC should hold much better.

Hope that helps.

 

[woodyp]

You may have to jack up FC 2 points above target level too. I do.

 

[loonyredhead]

The water gets a bit cloudy by the end of the day but is clear in the morning. I have a venturi style vac which doesn't get the fine dirt just stirs it into the water. The pump isn't greatest either but working on getting an upgrade. I will bump up my cya and fc as suggested and let you know how it turns out. Thanks!

 

[durtynacho]

Does a CC level of 0 necessarily mean no algae is present?

 

[pooldv]

No, it does not.

 

[MarianParoo]

If you passed the OCLT on the 1st, and it is cloudy now at times, try another OCLT. Then you will know. Also, you may want to test and add at night until you get to know your pool's habits better.

 

[loonyredhead]

I added CYA to bump it to 40 on 7/1, finally got test to read 40 on 7/3. Seemed to keep the FC loss to 2-3 a day. Yesterday kids said pool felt slimy on bottom. I decided to bump FC to 8 from 6. There isn't any cloudiness today. I did OCLT test last night. No loss of FC. So, no cc doesn't mean no algae. Is there anything else I need to look at again?

Last night tested chlorine 1 HR after adding 14 oz 8.25% chlorine to bump from 6 to 8, results:

FC 8
CC .5

This morning:

FC 8
CC 0
PH 7.4
ph 7.4
TA 100
ch 125

 

[pooldv]

If your daily FC usage seems higher than normal or you suspect algae then you can do the Overnight Chlorine Loss Test to see if there is something cooking in there.

 

[MarianParoo]

Is the bottom still "slimy"?

 

[loonyredhead]

There seems to be a spot or two. I scrubbed them up. I will do another OCLT again tonight but last night there was no FC loss and no CC with this mornings test.

 

[MarianParoo]

"Slimy" is a very good indicator of nascent algae.

Glad you brushed and are doing another OCLT. Good luck!!!!

 

[loonyredhead]

Last night test chlorine only
FC 3.5
CC 0


This morning:
FC 3
CC 0
PH 7.8

 

[MarianParoo]

You should be good to go then!