Water Treatment & Troubleshooting Guide

Your hot tub is designed to give many years of relaxing enjoyment. Following a few simple steps and understanding the water treatment cycle will ensure the maximum comfort and safety of bathers, and will aid in prolonging the life of your tub.


Chemicals are required in order to kill off bacteria that may otherwise lead to cross infection, to keep the water comfortable for those using the spa and keep it crystal clear and inviting.


We recommend you drain and re-fill the tub every 3 months depending on usage, in order to maximise the effectiveness of chemicals used in the water. Yorkshire Hot Tubs can help you with this – click here to see our Servicing Menu.




Recommended Water Maintenance Routine.


When adding chemicals always switch the main pumps on to circulate the water, remove the Hot Tub cover fully, and always follow instructions on the chemical packet.



Daily Maintenance.


Using the Test Strips;


  • Check Total Alkalinity level and dose as required with Fi-Clor Spa Alkalinity Increaser or Fi-Clor Spa ph & Alkalinity Reducer.

  • Check Sanitiser level and dose as required – we recommend Fi-Clor Spa Chlorine Granules, Fi-Clor Spa Chlorine Tablets or Fi-Clor Spa Bromine Tablets.

  • Carry out a visual inspection of the filter and clean if necessary with Lo-Chlor Instant Filter Cleaner spray.



Weekly Maintenance.


  • Shock-treat the Spa by adding Fi-Clor Spa Non-Chlorine Shock.

  • To minimise calcium build-up and staining caused by metals add Fi-Clor Spa Anti-Scale.

  • Check pH level and dose as required with Fi-Clor Spa pH Increaser or Fi-Clor Spa ph & Alkalinity Reducer.

  • Clean waterline with Fi-Clor Spa Surface Cleaner.





  • Deep clean the filter cartridge using Fi-Clor Spa Cartridge Cleaner.

  • After heavy bathing loads add Fi-Clor Spa Oxy-Brite – supplied in easy to use single dose sachets.

  • Remove foaming by adding Fi-Clor Spa Anti-Foam








Possible Cause



Eye / Skin


Excessive sanitiser levels

Dilute Spa with fresh water.

Build up of disinfection from


Dilute or completely re-fill spa with fresh water

Allergic reaction to sanitiser

Consider changing to a chlorine / bromine free system

such as Fi-Chlor Spa Active Oxygen

PH outside of the acceptable


PH over 7.6; reduce with Fi-Chlor Spa PH & Alkalinity reducer

PH under 7.2; raise with Fi-Chlor Spa PH Increaser



Build up of contaminants - body

oils or cosmetics

Treat with Fi-Chlor Spa Anti Foam



Build up of organic pollution and

/ or combined chlorine

Shock dose with Fi-Chlor Spa Non-Chlorine Shock or

Fi-Chlor Spa Oxy-Brite


Staining on

the shell

High concentration of metals in

the water

Treat with Fi-Chlor Spa Anti Scale




As above

As above




Low Sanitiser level

Test regularly and maintain sanitiser level; 2-5mg/l (ppm)

Chlorine; 4-6mg/l (ppm) Bromine

Ineffective filtration

Check filter; either clean with Lo-Chlor Instant Filter Cleaner

or Fi-Chlor Spa Cartridge Cleaner or replace filter.

Suspended Solids

Treat with Fi-Chlor Spa Water Clarifier to aid filtration

Build up of dissolved solids

Drain and re-fill with fresh water




High Calcuim Level

Treat with Fi-Chlor Spa Anti-Scale







Handled safely and with respect, your spa chemicals are perfectly safe, however if you misuse them or fail to follow the instructions, the consequences can be potentially serious, so there are a few rules that need to be followed;


  • Keep spa chemicals in their original containers, and keep sealed when not in use.

  • Keep all chemicas locked up, in a cool, dry place and out of reach of children and pets.

  • Never store chemicals in direct sunlight.

  • Read all labels to ensure you understand what the chemical is, how it is to be used and what it will do.

  • Never mix chemicals together.

  • When mixing chemicals with water always add chemicals to water, never water to chemicals.

  • Always handle your chemicals with care and accurately.

  • Should you spill any chemicals, clean up the spill immediately. If they are in solid form, use a clean dustpan and brush and dispose of them by adding small ammounts at a time to the spa. Do not put chemicals back into the container; do not use a domestic vacuum cleaner. If in any doubt contact Yorkshire Hot Tubs who will be happy to advise.

  • Never inhale chemical fumes

  • If any chemical comes into contact with your skin, wash off immediately with copious ammounts of fresh water.

  • If any chemical comes into contact with your eyes, nose or mouth, wash off immediately with fresh water and seek medical attention immediately.