Yellow in the sight glass

[Diver]

I haven't had a need to back wash my DE filter for over 2 months now and the sight glass on the multi-port grew all kinds of different things in there. It does have some distinct yellow spots:

So, I'm curious if this shows that the area that I'm in have some mustard algae spores around? The pool is all good, it's just the sight glass.

 

[JVTrain]

Yuck! I'd say you just have a algae bloom in the isolated vessel on the valve. Algae spores are everywhere and when that small vessel ran out of chlorine, somehow enough of the spores survived and went nuts. Whether it's mustard algae or not... hard to tell and I'm no botanist.

 

[woodyp]

I always empty out my sight glass after backwashing/rinsing and wipe it out.

 

[Diver]

i don't mind it being like that - it doesn't affect anything. as i mentioned in my original post i'm curious if this is an indication of yellow algae present in the area in general.

 

[JamesW]

It's better to keep the glass clean so that you can observe the waste water.

 

[Diver]

it cleans up in an instant once i start back-washing.

 

[easttn]

Ive never taken out my sight glass in ?10 years?. Its still as clear as it was from day one. The filter is inside a well house type structure so direct sunlight is not striking it. That could be the factor.

 

[JamesW]

The waste line appears to be holding water. It might be a good idea to remove the sight glass after backwashing to allow the line to drain. Alternatively, you could install an inexpensive vacuum breaker to allow the line to drain. Example: The Oatey 1.5" cheater vent (Model 39012) would work.