Pond Boss Forums GENERAL QUESTIONS Water chemistry Water Chemistry Log by QA

I got to the pond yesterday to find that my floaty scum has advanced into...





Here you can see that the scum is at the surface only. I turned the aerator on and it pushed the stuff out to expose the usual muddy looking water...



According to my research, it could be a one of the following or, more likely, a combination of...

Euglena and other flagellated algae,

Floating Cyanobacteria (Blue-Green Algae), and/or

Diatom Blooms

I have turned the aeration on full time thinking that DO is more important than water temp. If I see water temps hitting the 90's, I guess I'll reduce aeration? Any advice here?

I have also taken this mornings readings and will take a noon sample and a 5pm sample...

Time - 6:30am in BOLD , 12noon in RED, 5pm in GREEN

Ambient Temps - 75, 86, 90

Secchi Disk Reading - 12" (taken away from the scum for the most part), 13", 13"

Water temps - Top to Bottom 79 F., Top to Bottom 81 down to 79 F, Top to Bottom 83 down to 79

DO - 4-5 ppm, 4-5 ppm, 6.0ppm

TDS - 51 ppm, 54ppm, 56ppm

pH - 7 , 6.5, 7

Ammonia - 0.25 ppm, between zero and 0.25 ppm, between zero and 0.25 ppm

Nitrates - 0.0 ppm, 0.0 ppm, 0.0ppm

Phosphates - between zero and 0.25 ppm, between zero and 0.25 ppm, between zero and 0.25 ppm


I gathered a good amount of the light green, dark green, & dark brown floaty scum in a fine net and there was no smell whatsoever, maybe a slight pond smell.

This evenings photo op...