Silica sand is used in sand filters and is very hard wearing and the life is not as much dependent on the breakdown of the sand but more due to the build-up of trapped debris on the sand particle. A regular (annual) chemical clean of the sand will prevent the build-up of oils, greases, scale and general debris. The best way of gauging whether the sand is due for replacement is by monitoring the filter pressure. Should the pressure remain in the red even after an effective backwash procedure the chances are that the sand needs to be replaced.
The calculation is as follows: Length (m) x Breadth (m) x Average Depth (m) x 1000 in litres. (Rectangular Pool
In simple terms pH is a measure of how acidic or alkaline the pool water is. The pH range can be applied to any liquid and is a logarithmic scale of 0 to 14. I.e. A pH of 6.5 is 10 times more acidic than a pH of 7.5, whereas a pH of 5.5 is one hundred times more acidic than a pH of 7.5. The same applies to the reverse side of the scale. The comfort of the water and the effectiveness of the chlorine are governed by pH. Refer to water balance for more informatio
To remove Chloramines from the water. The building block of a Chloramines is Nitrogen which comes from swimmer wastes, thunderstorms etc. Nitrogen combines chlorine, the pool water becomes irritating to bathers and there is an unpleasant chlorine odour around the pool.
Fresh stains maybe removed with Metal magic. Brush pool surface for 7 days. Old stains may require more drastic treatment e.g. acid wash the surface.
To protect the chlorine from being destroyed by the sunlight. Allows chlorine residuals to last longer in the pool and saves pool owners money.
Check the pH and chlorine levels of the pool water. Low or high pH. pH should be 7.4 – 7.6.
6-8 hours between autumn and winter and 10-12 hours between spring and summer.
pH 7.2 – 7.6 Free Available Chlorine between 1 – 3 ppm Total Alkalinity (TA) Fibreglass: 125 – 150 ppm Marbelite: 80 – 125 ppm Calcium Hardness (CH) Fibreglass: 175 – 225 ppm Marbelite: 225 – 250 ppm Stabilizer - 40 ppm min
