10 Best Hot Tub Flush in The UK

Last updated on 08/08/2025

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Best Choice

9.8

Exceptional

Surespa

Surespa Ahh-Some Jetted Bath, Spa & Hot Tub Cleaner - Up to 4 cleans

Why We Love It

Removes biofilm and scale.
Generates significant cleaning foam.
Easy to use proportions.

Main Highlights

At each water change add approximately 1 teaspoon for every 500 litres of hot tub water prior to draining.
Run the pump(s) to circulate the water, ensuring that all jets and diverter valves are open.
Significant foam will be generated which must be rinsed away when the water is emptied.
Ahh-some will remove biofilm and scale build-up from inside the pipework and jets.
Use proportionaly less product in smaller water volumes down to a minimum of 1/2 teaspoon at each use.

10L of Pro-Kleen Hot Tub & Whirlpool Complete System Flush Cleaner

Why We Love It

Cleans plumbing & pipework efficiently.
Removes body oils & grime.
Kills and sterilises bacteria.

Main Highlights

Pro-Kleen Hot Tub & Whirlpool Complete System Flush is a professional, powerful formula designed to clean all the plumbing & pipework
Removes grease including body oils, general grime and bio film that develop over time in the pipework, which can lead to a deterioration in performance
Hot Tub & Whirlpool Complete System Flush removes dirt and grime, as well as nasty odours to leave pipework clear and smelling fresh
For hot tubs and whirlpools, simply fill with water to the top of the jets add 500ML to 1L of solution and run for 15 to 30 minutes
Use Pro-Kleen's System Flush at every water change for hot tubs and every 3 months for whirlpools

Pure-Spa Hot Tub Cleaner - System Flush 5L

Why We Love It

Freshens hidden pipework effectively.
Breaks down grime safely.
Contains anti-bacterial properties.

Main Highlights

Cleans and freshens inside the hidden pipework of your Hot Tub
Safely breaks down body fats, general grime and slime
Contains anti-bacterial properties for a fresher more hygienic spa
Does not contain harsh solvents, bleach or ammonia
Can be used at various dilutions depending on the level of cleaning required

Happy Hot Tubs One-Shot Hot Tub Flush Pipe Cleaner Drain Down FULL YEAR PACK (250ml x 3)

Why We Love It

Year-long pack for convenience.
Treats 1,300 litre capacity.
Cleans hidden pipe areas.

Main Highlights

One-shot hot tub pipework system flush 250mlx 3 (Year Long Pack)
Treats All Hot Tubs With a Water Capacity Up To 1,300 Litres
Use every 3-4 months at drain down (This pack last for a year with one drain down every 4 months)
Cleans where you can't see!
From Happy Hot Tubs, the UK's number 1 hot tub chemical / accessory retailer

Pro-Kleen 5 Litre Hot Tub & Whirlpool Complete System Flush with 1 Litre Hot tub and Spa Surface Cleaner Chemicals

Why We Love It

Professional, powerful cleaning formula.
Unique antibacterial properties included.
Prolongs hot tub lifespan.

Main Highlights

Part of the best selling Pro-Kleen Spa Range, this professional, powerful formula thoroughly cleans using natural products to remove dirt, slime and unpleasant smells from your hot tub, whirlpool or spa
Cleans inside the plumbing system, It completely flushes the system of your hot tub, whirlpool or spa. Regular use of Pro-Kleen's Hot Tub, Spa & Whirlpool Cleaner will prolong the life of your hot tub, spa or whirlpool.
This has been tested and designed for use in all hot tubs, spas and whirlpools.
This unique formula does not cause damage to the internal system or the environment.
Easy to use, long-lasting formula with clear instructions on the back of the bottle. Clean every3 months with 500-750ml of Pro-Kleen Hot Tub, Spa & Whirlpool Cleaner. This product has no expiry date!

5L of Pro-Kleen Hot Tub & Whirlpool Complete System Flush Cleaner

6% OffFree Shipping

Why We Love It

Professional and powerful cleaning formula.
Eliminates grime and biofilm.
Contains a strong bactericide agent.

Main Highlights

Pro-Kleen Hot Tub & Whirlpool Complete System Flush is a professional, powerful formula designed to clean all the plumbing & pipework
Removes grease including body oils, general grime and bio film that develop over time in the pipework, which can lead to a deterioration in performance
Hot Tub & Whirlpool Complete System Flush removes dirt and grime, as well as nasty odours to leave pipework clear and smelling fresh
For hot tubs and whirlpools, simply fill with water to the top of the jets add 500ML to 1L of solution and run for 15 to 30 minutes
Use Pro-Kleen's System Flush at every water change for hot tubs and every 3 months for whirlpools

Pro-Kleen Whirlpool Bath and Hot Tub Internal Pipe System Flush Cleaner (5L) - Provides a Deep, Hygienic Clean to Remove Limescale, Soap, Oil, Grease & Unpleasant Smells, Blue

6% OffFree Shipping

Why We Love It

Natural and powerful cleaning solution.
Extends life of your tub.
Easy, long-lasting application.

Main Highlights

Professional, powerful formula for hot tubs, whirlpools, and spas
Cleans all plumbing and pipework thoroughly
Removes grime, oil, biofilm, and general dirt build-up
Helps your system work efficiently and hygienically
Removes grease, body oils, and hidden grime in pipes
Prevents performance issues and potential system failure
Recommended with every water change for hot tubs
Recommended every 3 months for whirlpools
Easy to use: fill water to the top of jets, add solution
Run for 15–30 minutes for a complete system flush

Clean Start Your One Shot Hot Tub Pipe Cleaner 240ml Flush Biofilm Remover Spas

Why We Love It

Removes hidden biofilm build-up.
Fast-acting, works within 30 minutes.
Safe, non-corrosive formula.

Main Highlights

Clean Starter 1 Shot Hot Tub Pipe Flush (240ml)
Cleans the parts you can't see. Removes biofilm build-up from the pipes.
One-shot for all hot tubs
Non-corrosive formula.
Works in less than 30 minutes.

ClearSpa Hot Tub Flush 5L - Spa System Flush 5ltr, Hot Tub Flush Cleaner - breaks down and removes biofilm build up, dirt, oils, unpleasant smells from your internal spa & hot tub pipes

Why We Love It

Ensures thorough internal cleaning.
Loosens harmful biofilms effectively.
Ideal for spa maintenance.

Main Highlights

Spa & Hot Tub Flush should be used before the water is de-commissioned / drained down (typically no longer than 12 weeks for domestic spas and hot tubs) although heavy use will require more frequent drain downs.
This product is formulated to internally clean all the pipework and fittings and will also loosen biofilms which can provide an ideal environment for harmful viruses and bacteria to live.
ClearSpa full range of Spa, Hot Tub & Pool Chemicals

Zagosa Spa & Pool 5ltr Hot Tub Flush - Biofilm remover, system flush for spas and hot tubs

Why We Love It

Cleans all pipework and fittings.
Loosens harmful biofilms effectively.
Ideal for frequent spa maintenance.

Main Highlights

This product is formulated to internally clean all the pipework and fittings and will also loosen biofilms which can provide an ideal environment for harmful viruses and bacteria to live.
Spa & Hot Tub Flush should be used before the water is de-commissioned / drained down (typically no longer than 12 weeks for domestic spas and hot tubs) although heavy use will require more frequent drain downs.

8.7

Excellent

We scanned 937 products

We reviewed these offers relevant to the Hot Tub Flush within online retailers such as Amazon, eBay and other local retailers, ensuring we covered all major brands and models. The products we selected come from trusted brands like Surespa, Pro-Kleen, Pure-Spa, Happy Hot Tubs, Silk Balance, ClearSpa, Zagosa, all of which have a reputation for consistently delivering high-quality products that users love and innovative approaches for function & design.

For the best Hot Tub Flush in the market, we considered we took a deep dive into 4686 online reviews , focusing on elements like user satisfaction, performance in real-world conditions, and long-term reliability. Our ranking also evaluates each review’s relevancy, authenticity, up-to-dateness and depth so that the comparison is more sound.

We concluded that:

The clear winner of our analysis is Surespa Ahh-Some Jetted Bath, Spa & Hot Tub Cleaner - Up to 4 cleans. We love many things about this product by Surespa. What sets it apart from the competition is Removes biofilm and scale. , Generates significant cleaning foam. , Easy to use proportions.
The best value product for most shoppers and where user satisfaction is continuously the highest is 10L of Pro-Kleen Hot Tub & Whirlpool Complete System Flush Cleaner by Pro-Kleen based on online reviews by bloggers, experts and online shoppers.
The biggest bargain at the moment for Hot Tub Flush and the best cost-to-value ratio is Pro-Kleen Whirlpool Bath and Hot Tub Internal Pipe System Flush Cleaner (5L) - Provides a Deep, Hygienic Clean to Remove Limescale, Soap, Oil, Grease & Unpleasant Smells, Blueat Pro-Kleen with a 6% discount.
Our list of the best Hot Tub Flush is updated regularly to reflect new releases and changes in product availability, so be sure to check back often for the latest rankings and discounts.

10 Best Hot Tub Flush in The UK

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1L of Pro-Kleen Hot Tub & Whirlpool Complete System Flush Cleaner

ULTIMA-PLUS XP Hot Tub and Whirlpool System Flush - Deeply Cleans to Remove Dirt & Grime From Pipework - Easy to Use Formula (5 Litres)

AQUASPARKLE Hot Tub Flush 500ml

Pro-Kleen Hot Tub, Spa and Whirlpool Cleaner 1L - Hygienic, Long-Lasting, Easy to Use Formula - Suitable for All Hot Tubs, Spas + Whirlpools - Removes Bacteria, Dirt, Slime + Unpleasant Smells

ClearSpa Hot Tub Flush 1L - Suitable for Hot Tub, Spa and Swim Spa Water Treatment

Zagosa Spa & Pool 2.5ltr Hot Tub Flush - Biofilm remover, system flush for spas and hot tubs

Aquasparkle 0.5L Hot Tub Flush for Hot Tubs & Spa with FREE Sunbeach Dirt Buster Sponge

Pro-Kleen Whirlpool Bath Internal Pipe Cleaner (1L) - Provides a Deep, Hygienic Clean to Remove Limescale, Soap, Oil, Grease & Unpleasant Smells from Internal Pipes

SUDS-ONLINE 1 Litre Hot Tub Flush

Jarder Hot Tub and Spa System Flush 5L - Cleans and Sterilises all Internal Pipework - Removes Dirt, Oil, Grease and More - 10 Treatments per 5L

We scanned 937 products

We concluded that: