Tim Nicholson wrote:

snips...
this year, we're back to the same green murk once again. I also have
some barley straw bundles which I was also told would help, but as yet
(2 months on) they're not looking very efficient.

snips ...

We have quite good success with barley straw. You do need a reasonable
quantity and I find that it works best if put in early - begining of
February. I guess this allows the bacteria to plenty of time to get to
work and it starts acting before the algae have a chance to build up.

--
Larry Stoter