DPD1 PALINTEST TABLETS X 250 PHOTOMETER
DPD Tablet general information
DPD is an abbreviation of diethyl-p-phenylene diamine. DPD tablets react with pool water containing chlorine or bromine, colouring the water sample various shades of red. The deeper the colour, the higher the concentration of sanitiser. DPD tablet tests have largely replaced orthotolidine testing as this is considered carcinogenic. The DPD tablet No.1 is used to measure free or "available" sanitiser, the useful hypochlorous or hypobromous acid required for sanitising. DPD tablet No.3 is used after DPD1 to measure total chlorine or bromine. The difference between the two measurements is the combined chlorine (chloramine) or bromine (bromamine) value. Chloramines are an undesirable form of chlorine which do not sanitise and cause irritation. Bromamines have some sanitising value but do not generally irritate like chloramines. Either though indicates bather pollution.
DPD tablet use in domestic pools
A widely used type of test method for domestic pools is the dip cell or pooltester. This consists of a small plastic block with one or more cells into which the water sample is added. Coloured scales are provided next to each cell, showing the value of the measurement against the colour. In addition to chlorine and bromine, these are often used, with the correct tablet, to measure pH and alkalinity.
| Size | x 250 |
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