On 01/04/2021 09:22, Spike wrote:
On 31/03/2021 16:34, Peter Able wrote:
On 31/03/2021 17:40, Spike wrote:
On 31/03/2021 10:16, Peter Able wrote:
On 31/03/2021 09:36, Spike wrote:
On 31/03/2021 08:04, Broadback wrote:
On 31/03/2021 07:59, alan_m wrote:
On 30/03/2021 20:54, Martin Brown wrote:

"Wet and forget" is about the simplest to use.

https://www.amazon.co.uk/Wet-Forget-.../dp/B005IW4GWI

That is probably a lower concentration version of BAC50.

https://job-prices.co.uk/best-moss-killer/

BAC 50 prices seem to have risen significantly during our lockdowns but
should fall back to around £25 for 5L (incl postage), as they did after
the first lockdown.

I prefer to use biological washing powder, cheaper and just as
effective, also kinder on other things in and around the garden.

...is the right answer. I use four times the normal (washing)
concentration.

What would you reckon that works out as grammes of Bio Washing Powder to
a litre of water?

What amount of powder do they suggest for use in a washing machine? How
much water does the machine use for a main wash? The rest is simple
arithmetic...

I use liquid bio as we have some, and it's easier to mix, but you could
sprinkle the powder on directly, and either very lightly damp it or wait
for it to rain.

Only you have the data on which you based your statement, Spike.

Well, the data is that a 4x concentration of liquid bio watered onto
driveway moss made it go away, apparently mostly permanently.

I got the idea from a post on here late last year, which spoke of
builders who had replaced flat roofs, spreading powder bio onto the
chippings in order to prevent moss growth for a period of up to five years.

I hadn't got any powder bio to hand, and in any case didn't want my
tarmac surface covered with it, so decided to experiment by applying a
solution as described. In practise, about 10 percent of the moss
recently started to reappear, which was easily zapped with a
hand-sprayer of the type I mentioned.

Perhaps a 5x concentration might have killed it all, and if any returns
in Autumn I might try that.

Thanks, I've give it a go.

PA