Cloudy days and FC levels

[Jbrillo]

So it’s been cloudy(almost no sun) the last few days with some rain. My FC on 6/27 was 8.5. My CYA is 60 and I usually keep my FC at 8. I can maintain a FC 8ppm daily by setting my SWG at 40% for 13hrs a day this summer. Today, I checked my FC and it’s 12ppm.

My question is, can cloudy days really prevent that much FC from not being used and allow my FC to climb in just two days? Also, it’s suppose to rain for a few more days here(through July 4th). Should I try to lower it by turning down my SWG % knowing it’s going to stay cloudy for the next few days or just keep it where it is knowing as soon as our blistering sun returns, it’ll knock it back down.

I know, it’s nothing big, but I was just wondering what you guys would do.

Thanks!

 

[mknauss]

There is less FC loss due to UV when, well, there is less UV.

You can turn it down if you want. I would not. The FC is not hurting anything (unless you must manage pH regularly). It will burn off when the sun comes out.

 

[Jbrillo]

Thanks Marty for your response!
One more quick question, I know pH readings are unreliable when FC > 10, but is it a proportional thing or is it something nonlinear. Just wondering.

 

[mknauss]

The pH interference is more a timing thing. If you are able to read the pH in the first couple seconds, most of the time, it is pretty accurate. But I would not make any chemical additions based on it.

A pH meter is not effected by the FC.

 

[Jbrillo]

Ah, ok. I don’t have a pH meter. Thanks!