Best patio algae cleaner

[Patrick Bateman]

Has anyone tried the various different options and compared how long they can keep slabs clean?

Our back patio is very shady so I know that will reduce the time it stays clean but I’ve now used Algon organic twice and it’s only lasted around 3 months most recently. I’d have thought it could have lasted longer than that through the summer, especially after I gave it a proper soak.

I can get 10 litres for £28 but curious about the other options.

[98elise]

Sodium Hypochlorite (15%) from Amazon if its really bad. Its the only thing that touched the while alge on my block drive. You can water it down a bit if you want.

I roller it on to make sure it only goes where I want it. Don't let it run off onto any grass/flowerbeds.

Sodium Hypochlorite is Bleach, but 15% is way stronger than household strength.

[MDT]

Just buy some bog standard bleach from TESCO (other shops also sell). mix it 1:3 with water pore it on with a watering can.

I do this 2-3 times a year and juts lightly rub it in with a soft brush do it when it's not got direct sun light on it as it will dry quickly.

[zalrak]

BAC50 is what you need.

[Andy 308GTB]

zalrak said:

BAC50 is what you need.

This

[smifffymoto2]

Depends what your patio is.
SH will ruin limestone and some others and BAC 50 is sprayed on after you have cleaned it.

[Bainbridge]

+1 for household bleach, but I only use it as a 1% solution.

100ml in a 10ltr bucket of warm water, slosh it over the patio and brush it about with a stiff brush. The runoff onto the lawn doesn't kill the grass due to the low concentration.

Leave it a few days and the patio looks like new.

[ARH]

Bac50 for me, just mix it up pour it over,from a watering can and wait a day, no brushing or scrubbing keeps it clear for a year or so.

[Belle427]

Another vote for BAC50.

[Flat6er]

Bac 50 is your answer

[Double Fault]

ARH said:

Bac50 for me, just mix it up pour it over,from a watering can and wait a day, no brushing or scrubbing keeps it clear for a year or so.

What dilution rate do you use and does it need rinsing off?

[Rough101]

Double Fault said:

What dilution rate do you use and does it need rinsing off?

Doesn’t need rinsed, works over time, dilution depends on what strength you buy.

[ARH]

Double Fault said:

ARH said:

Bac50 for me, just mix it up pour it over,from a watering can and wait a day, no brushing or scrubbing keeps it clear for a year or so.

What dilution rate do you use and does it need rinsing off?

About 40 to 1. but I don't measure it precisely.