"John L" wrote ...
Our pond contracted blanket weed a few years ago and we've been fighting
it ever since.

This Spring it looks more aggressive than ever, thickly coating every
surface. Is it time to consider throwing the whole lot - liner and all -
away?

If so: when's the best time? Obviously after the tadpoles have
disappeared, but then wait until the "Back End"? And save _nothing_?

Yes, it happens to almost every pond to some extent. Made worse by topping
up with tap water (that contains nitrates), fertiliser washing into the pond
and planting up pond plants in normal fertile garden soil.
I usually find it bad at this time of year but it goes away as the normal
pond plants start to grow well.

--
Regards
Bob Hobden
W.of London. UK