Best Water Treatments Deals Online in the UK (25 Deals Found)

Last Updated - 09/09/2026 Sort By:

Best Choice
Tetra

New
Tetra AquaSafe to Turn Tap Water into Safe and Healthy Water for Fish and Plants, 250 ml
Tetra AquaSafe makes tap water safe for fish and reliably protects fish and plants against harmful substances contained

£6.27 £10.95
Tetra

New
Tetra AquaSafe to Turn Tap Water into Safe and Healthy Water for Fish and Plants, 500 ml
Tetra AquaSafe makes tap water safe for fish and reliably protects fish and plants against harmful substances contained

£12.32
New
Water Purification Tablets NaDCC 8.5 MG x 100, 1 Treatment Tablet = 1-2 litre
The World's Favourite Way to Make Water Safe. They are effervescent (self-dissolving) tablets, the US EPA approved activ

£9.95
API

New
API Stress Coat Aquarium Water Conditioner, 473 ml Bottle
Contains one API stress coat Aquarium Water Conditioner 473 ml Bottle

£11.75
New
Envii Water Butt Klear Treatment & Cleaner Remove Smells Clears Water Plant Feed
Envii Water Butt Klear. From removing the sludge from your pond to helping your garden grow, our products are natural an

£19.95
Best Value
AQUARIAN

New
AQUARIAN Tap Water Safe Fish Aquarium Water Conditioner, 118 ml Bottle
Contains one (1) AQUARIAN Tap Water Safe, Aquarium Water Conditioner, 118 ml Bottle

£2.38 £2.65
Clean Tabs

New
Clean Tabs 020837 Aqua Sol Water Treatment, 300ml Volume, Blue
Aquasol complete water treatment - 300ml

£9.99 £10.29
New
Envii Pond Klear Natural Treatment Clears Green Murky Cloudy Water Safe For Fish
Envii Pond Klear. When using natural bacteria, it can take up to 6-8 weeks. From removing the sludge from your pond to h

£12.95
31% Off
Blagdon

New
Blagdon Pond Fresh Start, Removes Chlorine, Makes Tap Water Safe for Pond Fish, 1L, Treats 9,092 Litres of Water
MAKES TAP WATER SAFE - conditions tap water effectively making it suitable for all fish and pondlife

£17.49 £25.49
New
PDV POND SALT 25 KG PURE DRIED VACUUM FOOD GRADE KOI FISH WATER TREATMENTS BATHS
British Salt PDV Pond Salt, for general health and care for pond fish. The PDV Pond salt is an industrial pure dried vac

£22.95
44% Off
Interpet

New
Interpet Quick Clear Aquarium Fish Tank Treatment, 125 ml, Rapidly Clears Cloudy Water, Natural and Safe Ingredients, fo
CLEARS CLOUDY AQUARIUM WATER - Use to clear cloudy water in your aquarium as part of your regular maintenance routine to

£4.49 £8.07
HYDRA

New
Hydra Fountain Clear Water Feature Cleaner | 60ml Treats 1,800L Highest Dilution Rates - Water Feature Treatment Keeps W
Crystal Clear Water: The Hydra Fountain Clear is a water fountain clarifier that can be used all year in both indoor and

£12.50
New
Interpet anti Hair Algae Aquarium Fish Tank Water Treatments, Kills Green Black
EASY TO USE - this bottle treats 1125 litres of aquarium water.

£4.95
envii

New
Envii Water Butt Klear - Natural Water Butt Treatment - Clears Green Water, Stops Odours, Keeps Water Healthy & Plant Fr
Clears Green Water in Water Butts - Water Butt Klear contains millions of beneficial bacteria to help clear green and mu

£12.95
New
CLOVERLEAF BLANKET ANSWER CLEARS BLANKETWEED TREATMENT KOI FISH POND ALL SIZES
Easy Application: Simply mix the product into a can or bucket containing 9 litres of pond water and pour it evenly over

£124.99
50% Off
Clearwater

New
Clearwater Water Clarifier for Hot tub Spa and Swimming Water Treatment for Pristine Crystal Clear Water (1L)
Fast Acting Water Clarifier: For use with hot tubs, swimming pools and paddling pools for crystal clear water

£4.99 £9.99
New
Cloverleaf Blanket Answer Blanketweed Treatment For All Seasons Thread Algae
Blanket Answer All Season is suitable for all types of ponds, from small garden ponds to large koi ponds. Effectively el

£99.99
New
INTERPET NEW TREATMENTS WATER HEALTH MEDICINE LIQUID TREAT AQUARIUM FISH TANK
Flora Boost will ensure optimum plant growth without stimulating algae growth. Finrot, Mouthrot/Mouth Fungus and Cotton

£7.40
New
Water Purification Treatment PURICLEAN 400g or 100g Caravan Cleaner
Puriclean 400g - Cleans up to 360L / 80 Gal. Puriclean 100g - Clean up to 90L / 20 Gal. Puriclean water cleaner and puri

£6.95
New
Ferric Chloride Concentrate - Large Pond Clarifier, Water Treatment, PCB Etching
Vital Minerals Ferric Chloride Pro Grade. Used to test the pitting and crevice corrosion resistance of stainless steels

£39.97
New
Water Purification Tablets NaDCC 167 MG x 50, 1 Treatment Tablet = 20 - 25 litre
The World's Favourite Way to Make Water Safe. Effervescent (self-dissolving) tablets, the US EPA approved active ingredi

£29.95
New
API Stress Coat Dechlorinator Water Conditioner Treatment Freshwater Aquarium
Available in multiple sizes, it effectively treats tap water, making it safe for your fish. Keep your fish happy and hea

£13.95
New
Anti Hair Algae Aquarium Fish Tank Water Treatments, Kills Green Black & Brown

£8.62
New
Tetra Pond Aquasafe Water Conditioner Dechlorinator Treatment Fish Koi Clarity
Tetra Pond AquaSafe makes tap water safe for fish, and reliably protects fish and plants in ponds against harmful substa

£12.99
New
Clearwater 1 kg Multifunction Chlorine Tablets, 4-in-1 Dispenser Tablets (Saniti
Clearwater 6kg Multi-Function Chlorine Tablets are an incredibly simple way to maintain clear and hygienic pool or hot t

£48.53

25 Water Treatments deals are available from: Amazon, eBay stores, starting from £2.38.
The biggest discount we found is 50% on Clearwater Water Clarifier for Hot tub Spa and Swimming Water Treatment for Pristine Crystal Clear Water (1L) at Amazon.
The lowest price we found is £2.38 while the highest is £124.99.
Prices for the best Water Treatments deals average at £22.37.
Last updated on September 9, 2026.
We scanned these quality online stores and more to deliver you with the best offers online available for Water Treatments.