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A question which is often asked by customers concerns the equivalent amount of one chlorinating agent that they would need to replace another chlorinating agent. It is difficult to give an empirical answer here as there are many factors which need to be considered, such as the mode of application, the pH of the chlorinating agent and the other compounds already pre-existing within the pool. However, as a guide, the following table adapted from NSPI recommendations (1) should assist in estimating equivalent dosages or usage rates.


* The mass of liquid chlorine needed to raise the residual by 1 ppm is 298 grams. The volume shown in the table is based upon a specific gravity of 1.2 for sodium hypochlorite.


Clearly, this table does not account for the added benefits of chlorine stabilisation in products containing sodium dichloroisocyanurate or trichloroisocyanuric acid, nor does it attempt to compare blended products, such as BioGuard Smart Sticks or BioGuard Lite. The additional benefits and features of such products should always be considered in choosing the appropriate chlorinating agent for a customer's pool.



1. National Spa and Pool Institute, "Basic Pool and Spa Technology", 2nd edition, NSPI, Alexandria VA, 1992, p. 285.


The above information is supplied by Bio-Lab and represents its best interpretation of available technical information at the time of preparation. The sole purpose is to supply factual information to Bio-Lab customers. It is not to be taken out of context nor used as support for any other claim not made herein.