How to keep concrete flags clean?

[Roger465]

My place has a LOT of concrete paving round it, out the back etc, and it was filthy and slippery with algae etc, so I’ve spent a few hours with the pressure washer, which has transformed it.

But… I suspect it’ll be back to how it was before within a few months at most…

Is there anything I can treat it with to stop or slow the deterioration? I can’t really pour bleach on it, as it drains into the garden

Ta

 

[Tigercubrider]

Not really

There are patio cleaners that can be added to the power wash but they are chemical

 

[Johnny Allround]

Try properla it’s designed to help with moss and fungicide growth on roofs. I’ve used it over the past few years no comebacks. It should work on patios because it creates a barrier. Hope this helps.