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Hot tub maintenance for domestic homes

It is essential that you learn the basics of looking after your hot tub.

Keep your water safe and crystal clear, minimise the amount of time and money you spend and maximise the time you spend enjoying your hot tub.

As a reputable retailer from BISHTA you can ask us for chemical advice.

pH to be maintained at:

7.0 to 7.6
The closer to 7.0 the better

If using Bromine: Bromine residual to be maintained at:

2 to 4mg/1 ppm

Inorganic chlorine: Chlorine residual to be maintained at:
(Usually sodium hypochlorite or calcium hypochlorite)

2 to 4mg/1 ppm

Organic chlorine: Chlorine residual to be maintained at:
(usually stabalised chlorine such as DiChlor or Trichlor)

3 to 5mg/1 ppm

Total alkalinity to be maintained at:

80 to 160 ppm

Daily maintenance:

  • Always test the water before use to ascertain pH and sanitiser readings.
  • Add required chemicals, as necessary, to correct any out of parameter readings, according to manufacturer’s directions on packaging.
  • If using bromine tablets, check status of bromine tablets in dispenser and add more if necessary.

Monthly maintenance:

Please note the following may need to be carried out more frequently – use tester strips as indicator.

  • Add a clarifying agent according to manufacturer’s instructions to help maintain water clarity. This should not always be needed, but maybe required e.g. after a party.
  • Check total alkalinity level and, if required, add a total alkalinity increaser.
  • Remove the pleated filter cartridge and soak in specific cartridge cleaner that is both acidic and aerosolised water droplets. Gently was off the cartridge and then allow to dry. Note:
    • Do not use a pressure washer for this task
    • Ensure that the power to the hot tub is turned off while the filter is removed from the hot tub.
  • Oxidise (or “shock dose” with non-chlorine shock) the hot tub with an oxidising agent according to manufacturer’s instructions to help eliminate bather waste after heavy use. Super chlorinate with a quick dissolving calcium hypochlorite at 20ppm for 2.5 hours to try to eliminate bacteria that may have developed a resistance to sanitiser at normal residuals and to oxidise biological impurities in the water. Note:
    • If the hot tub is particularly heavily used, after a party for instance, it may be necessary to oxidise more often.

Every 1-3 months

  • Super-chlorination using a quick dissolving calcium hypochlorite will both oxidise to help break down combined chlorine and will quickly kill bacteria. Shock dosing at hot tub at 20ppm for 2.5 hours is recommended upon initial fill of a hot tub and ideally monthly thereafter – no more than three months maximum.
  • Completely drain your hot tub down and clean the inside of the shell with a specialist hot tub surface cleaning product. DO NOT use proprietary household cleaning products such as Jif, Flash, Fairy etc. The drain-down time is dependant on how heavily used it is, especially if the water chemistry becomes harder to maintain despite all your efforts, or if the water looks lank, tired and slightly musty despite the chemestry being within the parameters.


Use pH Minus to reduce a high pH, OR pH Plus to raise a low Ph.

Do not check pH for at least 20 minutes after the hot tub was last used, to allow time for all bubbles to dissipate.

It’s a good idea to buy a second set of spare filters so that whilst one set are being cleaned, rinsed and dried, the second set can be in the hot tub filtering the water.

Bear in mind that, a hot tub will see its heaviest usage in the first six months of ownership, so be particularly diligent until usage settles down

Always switch off power to a hot tub when removing the filter.

Always store, handle, and add hot tub chemicals according to the directions on the manufacturer’s packaging, and ensure you use and operate your hot tub according to the owner’s manual.

Hot tub chemicals Halifax