Hi Tancho Boy
Did you ever receive an answer to your query?
Seems to be more noticeable when the weather cools down.
I have nine small water returns from my 5 up flow filters.
When the water level drops and turns them into mini waterfalls as opposed to cascading rapids.
The DOC foam occurs, the one return is adjacent to my weir/skimmer,the water surface with in the weir becomes filled with foam and the water surface tension changes
and will no longer draw in more foam.
The answer might be within the paperwork here, if it is, maybe somebody would be good enough to direct us to it.
I saw the question which has no reply and decided to take it up and maybe somebody would be good enough to explain why this condition occurs.
Cheers and thank you,
Garfield
