Best Natural Algaecides

SmartSeal Patio Cleaner Xtreme - Powerful Easy To Apply Patio Cleaner Fluid - Highly Concentrated Patio Black Spot Remover and Paving Slab Cleaner - Eradicate Stubborn Patio Black Spots (5 Litres)

envii Algae Klear Xtra – Blanket Weed Treatment for Ponds, Removes Blanket weed & String Algae Working All Year Round, Safe for all Fish & Plants – 500ml Treats 10,000 litres

Blagdon Pond Algaway, Removes Blanketweed and String Algae, Pet & Wildlife Safe, Large, Treats 45,845L of Pond Water

GARDIAN Algae Remover - 1 Litre - Fast-Acting and Safe Algae and Lichen Remover - Patio Cleaner to Eliminate Algae, Lichen and Other Similar Growths from Patios, Decks, Fences, and Garden Paths

HYDRA BLACK LIQUID DYE 250ml treats UpTo 1063 litres Concentrated Liquid Pond Dye Free of Pesticides, Algaecides Safe for pets fish plants

CopperFlo Solar Pool Ionizer - High Capacity | 85% Less Chlorine | Lifetime Replacement Program | Kill Algae | Longer Lasting Copper Anode | 25% More Ions | Keeps Pool Cleaner | Up to 45,000 Gal

AquaSPArkle Spa Sparkle Natural Water Clarifier 1lt

Natural Water Feature Cleaner Keeps Water Features Clear (300g)

Garden Xpert Patio Cleaner Concentrate | 5 Litre (2 Pack) | Suitable for Patios, Natural Stone, Paving Slabs, Decking, Brickwork | Huge Coverage | Biodegradable | Pet Friendly Once Dry

Homefront Organic Patio Cleaner - Pet Friendly Formula & Free From Bleach and Harsh Chemicals - Deeply Cleans to Remove Dirt and Grime (10 Litres)