We usually advise if the water is over two months old it is best to dump it and start over.
If it is under that then all you have to do is follow these instructions if you are using a chlorine free sanitiser.
START UP PROCEDURE:
Step 1. Clear the water
Water as supplied by the water authorities has chlorine included and so this needs to be eliminated if we are to have a chlorine free spa. Simply use a chlorine free sanitiser such as Popptis Spa Sanitiser and filter for 4 hours. This will oxidise the chlorine and any other unwanted matter in the water.
Rain water and bore water also needs to be treated.
Step 2. Balance the water
Using a water test kit or strip, check the pH, alkalinity and calcium hardness levels of the water.
The pH should be around 7.4 – 7.6 to be comfortable for people with sensitive skin. Total alkalinity should be between 80 – 120pp. If necessary, adjust these two levels using a Water Balance to increase or decrease.
Calcium levels that are lower than 100ppm can be damaging to equipment, as well as making it difficult to maintain pH levels and ultimately cause the water to go cloudy.
Rain water is usually low in calcium. Ideal levels for calcium hardness are between 100 and 200 ppm. To increase calcium levels use Calcium Increaser as per label directions.
Step 3. Sanitise the water
The water is now clear of contaminants and balanced and all that needs to be done is to sanitise the water with chlorine free sanitiser - Conditioner, bactericide and clarifier as per label directions.