Concentrate - Green Algae, Liverwort & Mould Remover for Large Outdoor Spaces – Cleans & Brightens Fences, Roof Tiles, Solar Panels, Concrete, Tarmac & Bricks up to 1250 m² - 5 Litres

This is very effective and lasts well. Previously sprayed parts of house walls to remove algae and moss and two years later it's not returned. Didn't have sufficient last time to complete the job and there's a clear demarcation line where I ran out. Better to make a saving and buy concentrate than premixed.

It killed the treated moss but it doesn't prevent more growth.

Liverwort is really hard to get rid on, especially once it takes hold in block paving. This product will kill it off but I will have to use it several times a year - I haven't found anything yet that will permanently kill it off. Given the need to use it multiple times, this product is more cost effective than others I've tried.

This is perfect for removing liverwort.

Used on a shady block driveway. Had used a wire brush and hose a few days before to attack the worst, but lots of algae still present and in places I couldn’t brush. Was going to use a pump spray to apply but it was faulty so I used a watering can instead. Wore a respirator, gloves and safety goggles for mixing and dispensing as always careful with chemicals. Smelt quite strong, and perhaps the can was less accurate than a spray, but all the green has gone and the drive looks brilliant. We’d had a few dry days both before and after so optimum conditions. Will report in due course on how long it lasts. It’s been incredibly successful and cost me £15.95 when a contractor quoted me £80.

I was hesitant buying this after reading the other review, but thought I would give it a go. Very glad I did. We had heavy liverwort coverage on a damp area of driveway - this killed it after 1 application. You do need the area to be pretty dry for a few days beforehand, and for a day after (not a common occurrence here in Northern Ireland!) so the chemicals are absorbed by the 'thirsty' liverwort. After a couple days the liverwort was dead - it doesn't remove it, you would have to scrape it away or wait for it to rot to nothing.

Had worked well on my drive to remove green algae

Works to varying degrees