Quote Originally Posted by Tom.B View Post
and one more time tomorrow after work to check daylight loss.
Ok, so here's the latest. I did a complete work-up just for the practice.

Free Chlorine 5 (Loss of 1.5 PPM through the daylight)
Combined Chlorine 0.5
PH 7.2
Total Alkalinity 80 (down by 10)
Calcium Hardness 390
CYA (Stabilizer) 55+

It looks okay to me and seems to be trending to where you guys suggest it should be. I added another pound of dichlor (Leslie's ChlorBrite) for good measure... AND THEN... (see below)

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So... I went to do my brushing I do a few times a week and there is still a covering of yellow on the bottom. I have, over the past few years, played it off to be pollen, or sometimes thought that it could just be the early stages of green algae. However, now it's time to take a serious look at what it is and try and catch it sooner than later.

I suppose I need to start a thread in the algae sub-forum (and will if you would like me to), but my question is: How can you tell if it's mustard algae? I don't see any high demands for chlorine, but I don't know if that is an indicator or not.