Posted: 18/02/2018 at 18:09
GD - never heard of black dye for a pond ( didn't see the programme ) but what reason did AT give for using it ? If it was suggested just for the "look" of it, I wouldn't waste time or money and I'd be a bit surprised at AT for promoting it on that basis alone.
Does it contain something to kill blanket weed ? As you know, usual method is to remove it by hand ( or stick ! ). Barley bales or the barley liquid will help as will a good coverage of surface vegetation ( watercress does well - grows thru winter here in the SW - good salad pickings too ).
Your pond is relatively new I think so it needs a year or two to settle down perhaps ?
Personally, I'd be wary of adding anything other than plants