In particular, its a pernicious black type that grows in 'spots' that resist
all but the most determined powerwashing, in fact the concrete goes at the
same time. Power washer, bleach,and jeyes fluid are all proving no match.
Any suggestions? Are there algae cleaners you can buy that are any better?

--
Tumbleweed

Remove my socks before replying (but no email reply necessary to newsgroups)

Try brushing one of the spots with neat Jeyes Fluid and I think you will
have some success.

Regards,
Emrys Davies.


"Tumbleweed" wrote in
message ...
In particular, its a pernicious black type that grows in 'spots' that
resist
all but the most determined powerwashing, in fact the concrete goes at
the
same time. Power washer, bleach,and jeyes fluid are all proving no
match.
Any suggestions? Are there algae cleaners you can buy that are any
better?

--
Tumbleweed

Remove my socks before replying (but no email reply necessary to
newsgroups)

" Emrys Davies" wrote in message
...
Try brushing one of the spots with neat Jeyes Fluid and I think you will
have some success.

Regards,
Emrys Davies.

I think that will cost me about £1000 in Jeyes fluid to clean it all up
though, it would be cheaper to get new paving laid :-)

Its not just that there are thousands of spots, these are what are left
after severe pressure washing, and there is still a coating of algae there
as well! Maybe its lost cause.

--
Tumbleweed

Remove my socks before replying (but no email reply necessary to newsgroups)

The message
from "Tumbleweed" contains
these words:

" Emrys Davies" wrote in message
...
Try brushing one of the spots with neat Jeyes Fluid and I think you will
have some success.

Regards,
Emrys Davies.

I think that will cost me about £1000 in Jeyes fluid to clean it all up
though, it would be cheaper to get new paving laid :-)

Its not just that there are thousands of spots, these are what are left
after severe pressure washing, and there is still a coating of algae there
as well! Maybe its lost cause.

You could try going over it with a flamegun; it should fry the
algae/spots to dust.

Janet.

Try using Formaldehyde.. horrible to use but will do the job.

--
David Hill
Abacus Nurseries
www.abacus-nurseries.co.uk

Tumbleweed wrote:

" Emrys Davies" wrote in message
...
Try brushing one of the spots with neat Jeyes Fluid and I think you will
have some success.

I think that will cost me about £1000 in Jeyes fluid to clean it all up
though, it would be cheaper to get new paving laid :-)

Its not just that there are thousands of spots, these are what are left
after severe pressure washing, and there is still a coating of algae there
as well! Maybe its lost cause.

If you can stand the smell just water it all over with dilute Jeyes fluid on a
sunny day and leave it to dry. It kills algae stone dead - may take a week or
two but is pretty effective. Don't get it on other green plants.

Regards,
Martin Brown

In article ,
david wrote:
Try using Formaldehyde.. horrible to use but will do the job.

Try a a stiff broom, some sharp sand, some water and possibly a squirt
of washing up liquid. It works a dream and isn't horrible to use.
Why does everyone think in terms of toxic chemicals?


Regards,
Nick Maclaren,
University of Cambridge Computing Service,
New Museums Site, Pembroke Street, Cambridge CB2 3QH, England.
Email:
Tel.: +44 1223 334761 Fax: +44 1223 334679

Nick Maclaren wrote:
...
Why does everyone think in terms of toxic chemicals?

Gotta get your kicks somewhere ;o)

--
William Tasso

"Martin Brown" wrote in message
...


Tumbleweed wrote:

" Emrys Davies" wrote in message
...
Try brushing one of the spots with neat Jeyes Fluid and I think you
will
have some success.

I think that will cost me about £1000 in Jeyes fluid to clean it all up
though, it would be cheaper to get new paving laid :-)

Its not just that there are thousands of spots, these are what are left
after severe pressure washing, and there is still a coating of algae
there
as well! Maybe its lost cause.

If you can stand the smell just water it all over with dilute Jeyes fluid
on a
sunny day and leave it to dry. It kills algae stone dead - may take a week
or
two but is pretty effective. Don't get it on other green plants.


I'm already subject to many comments about the smell!! (Of the Jeye's fluid
I hasten to add)

--
Tumbleweed

Remove my socks before replying (but no email reply necessary to newsgroups)

"Nick Maclaren" wrote in message
...
In article ,
david wrote:
Try using Formaldehyde.. horrible to use but will do the job.

Try a a stiff broom, some sharp sand, some water and possibly a squirt
of washing up liquid. It works a dream and isn't horrible to use.
Why does everyone think in terms of toxic chemicals?


I was thinking chemicals. No particular requirement for toxicity.

--
Tumbleweed

Remove my socks before replying (but no email reply necessary to newsgroups)

Tumbleweed wrote:

"Nick Maclaren" wrote in message
...
In article ,
david wrote:
Try using Formaldehyde.. horrible to use but will do the job.

Try a a stiff broom, some sharp sand, some water and possibly a squirt
of washing up liquid. It works a dream and isn't horrible to use.
Why does everyone think in terms of toxic chemicals?


I was thinking chemicals. No particular requirement for toxicity.

Physical abrasion by sharp sand isn't a bad solution though. It will work.
Chances are you may need to use a combination of methods to get the more
persistent bits off.

Regards,
Martin Brown

Try a stiff broom, some sharp sand, some water and possibly a squirt
of washing up liquid. It works a dream and isn't horrible to use.
Why does everyone think in terms of toxic chemicals?

Well in defence.....
The sand and stiff broom may well SHIFT the algae, but it wont Kill it, so
you will have the problem back again quite quickly,
Formaldehyde will kill the algae and spores.

Alternatively you could tarmac over the top......


--
David Hill
Abacus Nurseries
www.abacus-nurseries.co.uk

In article ,
"david" writes:
| Try a stiff broom, some sharp sand, some water and possibly a squirt
| of washing up liquid. It works a dream and isn't horrible to use.
| Why does everyone think in terms of toxic chemicals?
|
| Well in defence.....
| The sand and stiff broom may well SHIFT the algae, but it wont Kill it, so
| you will have the problem back again quite quickly,
| Formaldehyde will kill the algae and spores.

As they are ubiquitous in dust, that is only a temporary gain.
I should be surprised if it reduced the frequency of attention
needed by a large factor.

| Alternatively you could tarmac over the top......

Once the toxins have leached from the surface, algae will grow
quite well on that - and most domestic tarmac will break up if
you scrub it hard.


Regards,
Nick Maclaren,
University of Cambridge Computing Service,
New Museums Site, Pembroke Street, Cambridge CB2 3QH, England.
Email:
Tel.: +44 1223 334761 Fax: +44 1223 334679

'Twas Sat, 16 Nov 2002 17:11:13 -0000, when "Tumbleweed"
enriched all our lives
with these worthy thoughts:

Any suggestions? Are there algae cleaners you can buy that are any better?

We use a low-pressure steam cleaner to remove algae and
lichens from concrete. There's a pic of the machine in question in the
'Cleaning Gum' section of the Removing Stains page of my paving
website....

http://www.pavingexpert.com/stains.htm#gum

....it can be hired for larger jobs, or there's a company that
will come and do it all for you. :~)

--
cormaic URG faqs/webring - www.tmac.clara.co.uk/urgring/
Culcheth Garden - www.tmac.clara.co.uk/garden/
Warrington Paving - www.pavingexpert.com/
Peoples' Republic of South Lancashire

cormaic CAN BE FOUND AT borlochshall.co.uk

"cormaic" wrote in message
...
'Twas Sat, 16 Nov 2002 17:11:13 -0000, when "Tumbleweed"
enriched all our lives
with these worthy thoughts:

Any suggestions? Are there algae cleaners you can buy that are any
better?

We use a low-pressure steam cleaner to remove algae and
lichens from concrete. There's a pic of the machine in question in the
'Cleaning Gum' section of the Removing Stains page of my paving
website....

http://www.pavingexpert.com/stains.htm#gum

....it can be hired for larger jobs, or there's a company that
will come and do it all for you. :~)


Thanks, I might check out my local hire company. Or I wonder if one of those
wallpaper steamers might do the job?

--
Tumbleweed

Remove my socks before replying (but no email reply necessary to newsgroups)