Can you use on porcelain slabs?

If your porcelain slabs are acid sensitive then this product is not recommended. Instead use HG Extreme Power Cleaner to remove the algae and mould.

Can it be used near artificial grass?

Dear Madam- our product contains a bleaching element that could damage the artificial grass.

Could this be used on a wooden staircase without damaging the wood?

Sorry, I can't be of any help to you. Ive used it only on a wooden fence outside where it worked very well and did no damage to that.

Is it safe near a pond

That depends what you have in the pond. This is an algae and mould remover. So it will kill algae. I would not expect that it will do pond life any good at all as it will be similar in action to bleach. From memory, the label indicates that it is a hazardous material. If you want to use it to remove algae from around the border of a pond then you should try to prevent the HG liquid from getting into the pond. I would cover the pond with polythene and tape the edges to stop the liquid and any vapour from getting to the pond surface, particularly if you have fish in the pond. Why not scrub the algae away with a stiff brush and plain cold water?

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HG Algae & Mould Remover | Concentrated Patio & Path Cleaner | Stone-Safe Biocide for Paving Slabs & Outdoor Areas | 1L

HG Algae & Mould Remover | Concentrated Patio & Path Cleaner | Stone-Safe Biocide for Paving Slabs & Outdoor Areas | 1L

Product ID: 55380196

Details

Active ingredients
green algae
Brand
HG
Item form
Liquid
Item weight
1.87 Pounds
Liquid volume
1000

🌿Safe for plants when diluted

🧴1L concentrated formula

⏱️Visible results in 36 hours

¥7131

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌟 Transform your outdoor space with HG – because your patio deserves the VIP treatment!

MULTI SURFACE MASTERY - Safe and effective on stone, concrete, tiles, roofs, fences & more
PLANT FRIENDLY FORMULA - Diluted solution is safe for surrounding grass and garden plants
POWERFUL FAST ACTING - Kills algae, mould & fungus with visible results in just 36 hours
LONG LASTING PROTECTION - Prevents regrowth to keep your outdoor spaces pristine longer
ULTRA ECONOMICAL COVERAGE - Cleans up to 200m² per bottle—perfect for large patios & paths

HG Algae & Mould Remover is a concentrated 1L biocide designed to rapidly eliminate algae, mould, lichen, and fungus from a wide range of outdoor surfaces. Delivering visible results within 36 hours, it covers up to 200m² when diluted and is safe for plants, making it the go-to solution for maintaining pristine patios, paths, and exterior areas with long-lasting protection.

Specifications

ASIN	B000IU3VTE
Active Ingredients	AQUA, DIDECYLDIMONIUM CHLORIDE, ISOPROPYL ALCOHOL
Active ingredients	AQUA, DIDECYLDIMONIUM CHLORIDE, ISOPROPYL ALCOHOL
Best Sellers Rank	10,858 in Garden ( See Top 100 in Garden ) 49 in Moss Control 5,145 in Home Care & Cleaning
Brand	HG
Brand Name	HG
Coverage	Broad-spectrum coverage for moss, algae, and mould
Customer Reviews	4.3 out of 5 stars 405 Reviews
Global Trade Identification Number	08711577002916
Included Components	HG Algae and Mould Remove
Item Form	Liquid
Item Weight	1.87 Pounds
Item form	Liquid
Item weight	1.87 Pounds
Liquid Volume	1000 Millilitres
Liquid volume	1000 Millilitres
Manufacturer	HG Hagesan (UK) Ltd
Model Number	181100106
Part Number	181100106
Unit Count	1000.0 millilitre

Reviews

C**D

good cleaner

Arrived fast and as described.

3.07.2026

G**Y

Will buy again

Very good works well

26.05.2026

J**M

Does a good job of removing algae, but not a dedicated "cleaner"

Decent product, our patio gets so slippery with algae and surface dirt it's a real hazard. This product makes the surface safe again. I wouldn't say it's the best cleaner as the patio still looks a bit stained, but I will find something else for that. Priority was to get rid of the slipperiness.

6.01.2025

V**T

Excellent works

Best product on the market

3.04.2026

P**N

Green algae on patio York stone slabs

I applied the algae remover diluted to manufacturers suggestion via my watering can sprinkler. It was quite dark green in parts. After 2-3 days it was lighter but still green. So I repeated the process. Have to be sure get 3 dry days in a row. Again better but definitely not gone. Am on 3rd application to date. Also tried it on front path which was lightly affected by moss & algae. Made no difference. Used whole bottle. Will buy something else in the hope it works better. Maybe this stuff is for light areas of algae? Didn’t work for me.

6.04.2024

M**K

Algae remover from masonry and paths

This really does work, I diluted it so it will last a good while. I had green patches on a wall and sprayed it and two days later it looked fine

26.02.2026

A**W

Perfect for the job.

Great product at a great price.

30.03.2026

A**H

Mould removal

Good product took some time to arrive

6.04.2025

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TrustScore 4.5 | 7,300+ reviews

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The product quality is outstanding. Exactly what I needed for my work.

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¥7131

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Meera L.

Smooth transaction and product arrived in perfect condition.

3 weeks ago

Fatima A.

Best international shipping I've ever tried. Worth every penny!

3 days ago

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