Testing the water regularly & always before using the pool or tub is the best thing to do. If the tablets are not coping with the demand then add more or if the chlorine level is too high then reduce the amount.
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Pool Cleaning Effervescent Chlorine Tablet Long-Lasting Effervescent Tablets Water Care Pool Tablets For Hot Tub Water Cleaning
Aliexpress UK
Water in pools and spas should be tested daily, you are aiming to achieve a pH level reading between 7.2 and 7.6 before adding the chlorine. Use pH+ or pH- to adjust if necessary. Pool free chlorine levels must be between 1ppm and 3ppm and spas should be between 3ppm and 5ppm .
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Pool Chlorine Tablet Dispenser Solar Floating Chlorine Dispenser Colorful Downlight Tub Chlorine Floater Floating Water Cleaner
Aliexpress UK
1KG (50 X 20g) multifunctional chlorine tablets ( IN RESEALABLE TUB). A new and improved version of the Chlorine tablets. For EASY maintenance of chlorine levels. the rate at which they dissolve will vary depending upon water flow and temperature.
eBay
100pcs/Box Swimming Pool Cleaning Tablet Chlorine B romine Tablets Cleaner Swimming Spa Hot Tub Household Deep Cleaning Tool
Aliexpress UK
50 x 20g High Quality Multifunctional chlorine tablets are highly effective and formulated to ensure safe bathing by protecting against unwanted algae and bacteria. The multifunctional tablets provide a slow release of chlorine, algaecide and clarifier.
eBay
100Pcs/Box Chlorine Bromines Tablets Pool Cleaning Tablets Cleaner Disinfectioning Pills Spa Hot Tub Household Cleaning Products
Aliexpress UK
18 hot tub Chlorine Tablets & chlorine tablet Dispenser - best Quality spa Chlorine Tablets 20g. Hot Tub Chlorine tablets for hot tubs spas tubs pools water. Always insure that your PH is at the ideal level between 7.2 - 7.6 to promote bathers comfort and for the care of your spa or pool.
eBay
100PCS/Bottle Swimming Pool Chlorine Tablet Quick Dissolving Effervescent Pool Cleaning Tablets Hot Tub Pool Clean Tools Cleaner
Aliexpress UK
The chlorine tablets can be used to swimming pools, hot tubs and spas, bathtub, hot spring pool, sauna pool and water park, etc. Suitable for swimming pools, hot tubs and spas, bathtub, hot spring pool, sauna pool and water park, etc.
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Floating Swimming Pool Chemical Floater Chlorine Bromine Tablets Floating Dispenser Applicator Swimming Spa Hot Tub Supplies
Aliexpress UK
50 x 20g High Quality Multifunctional chlorine tablets are highly effective and formulated to ensure safe bathing by protecting against unwanted algae and bacteria. The multifunctional tablets provide a slow release of chlorine, algaecide and clarifier.
eBay
Floating Swimming Pool Chemical Floater Chlorine Bromine Tablets Floating Dispenser Applicator Swimming Spa Hot Tub Supplies
Aliexpress UK
Designed for Hot Tubs, Spas,Jacuzzi. A new and improved version of the Chlorine tablets. For EASY maintenance of chlorine levels. They have a high level of available chlorine and contain chlorine stabiliser.
eBay
50Pcs 2g Chlorine Tablets Cleaning Agent Multifunction Instant Disinfection Cleaner For Home Swimming Pool Spa Hot Tub Supplies
Aliexpress UK