Problem: algae re-colonised a concrete slabbed patio after softwashing
A customer asked us to analyse the reasons why a concrete slabbed patio he'd softwashed with Benz Bio Cleanze recolonised with light green algae.
He reported that some of the slabs had re-colonised after only a few months and was concerned because he had offered a 6-month guarantee.
This is what we told him ...
On concrete patios light green algae can flare up again because of one of, or a combination of, these reasons:
1. The grouting has failed and is in very poor condition. This gives the algae lots of cracks to hide in and then flare up again. Water lodges in the cracks, which encourages regrowth of the algae.
2. The grass lawn is higher than the patio so what happens a lot of the time is the cut grass blows down onto the patio and then decomposes, breeding algae at the same time. We've often seen a flare up of green algae where grass cuttings have been left on a clean path or drive. On our own drives we've noticed this happening when grass cuttings fall off the lawnmower moving from one lawn to another. And of course once algae gets a hold in one place it's easy for it to spread.
3. The drainage is poor and "pooling" is occurring. Patios need a good drainage system as pooling will encourage regrowth of algae. Sandstone is especially vulnerable and if it pools water it will need regular treatments to keep on top of the tendency for algae to recolonise.
4. The customer may have placed plant pots, and/or garden furniture, on the patio after the surface has been cleaned. These quite often overflow and spill soil and other organic material onto a patio. And of course algae can grow under them and spread. Also, the outside of terracotta pots often have a heavy biofilm that will encourage re-colonisation of a treated surface.
5. Moss could be falling from the roof onto the patio and doing the same as the grass in point 2.
6. Leaves from trees could be falling onto the patio and doing the same as grass in point 2.
Because of the above reasons, including the amount of shade and exposure the patio gets, and depending on the surface and general environment, a light re-treatment wtih Bio Cleanze in the autumn, to treat the flare-up of green algae after a summer treatment, is sometimes necessary to be able to keep a patio clean all year long.
This is because the active ingredient in Bio Cleanze is still relatively fresh when the damp, mild conditions come in, thus offering a better chance of keeping the surface free from infestation.
The cost of regular re-treatments should be relatively small, as there is very little preparatory work needed compared to a new clean of a surface that hasn't been cared for.
Another approach would be to apply Benz Lightning Cleanze in the summer to get the surface initially clean and then a treatment of a Bio Cleanze in the autumn/winter as ongoing maintenance.
Re guarantees: Our customer told us he had offered a 6-month guarantee. In Ben's Performance Cleaning softwash business he never offers this for paths, patios and drives because there are so many variable factors involved that are out of his control.
For example, he cannot control whether his customers sweep up leaves and grass cuttings, or control their placement of plant pots and items of garden furniture. And of course the quality of grouting on patios varies enormously, and is itself subject to decay leading to it becoming a catchment area for algae spores.
The same applies to cracked concrete paving slabs, where the cracks become breeding grounds for algae spores.
We've found the best approach is to simply, and carefully, explain to your customers the problems that can arise and what they can do to reduce the propensity for algae to regrow. And explain why the condition of their patio may limit the effectiveness of any cleaning treatment.
We've found that almost everyone is open and receptive to quality professional advice because they know it will help them better maintain their property. Then they won't expect you to work miracles ... but simply do the best you can.
We hope this information was helpful and inspires you to succeed in your softwashing business.
Ben, Leo & Fiona
Leave a comment
Comments will be approved before showing up. Please revisit this Trade Tips post to read our response.
Also in Benz Trade Tips
How can you learn the practical how-to of soft washing quickly, easily and simply – without wasting several years "re-inventing the wheel" – learning through arduous trial and error – when you could have been up and running in a few weeks?
And earning well-deserved profits from a highly efficient soft washing business.
Then there is the thousands of pounds/euros that the unwary, knowing no better, can waste on expensive, and often unnecessary or inappropriate, softwash equipment. We're sure you don't want to be like them.
Click the link on this page to learn more ...
In this ongoing soft washing video series Ben explains why and how he uses various types of softwash equipment.
What soft washing equipment you choose to build or purchase depends on several factors: for example the number of employees you have and the type of properties you soft wash.
Want to know more?
Click the link on this page to watch the video ...
(Due to logistic problems associated with the government restrictions around Covid-19 this is a written, not video, Trade Tips post this week)
That's a reasonable question.
You could jet wash a roof and then treat with Bio Cleanze.
But why would you?
Want to know the rest of the story? Click the link on this page ...