The typical scenario when using Dechlormats involves getting a situation under control. Chlorinated water is escaping either into a ditch or creek bed or it may enter a storm drain intercept. The problem is that chlorinated water may be reach sensitive receiving waters.

How many tablets are required?

Usually it is a case of "the more the better." One LPD-Chlor tablet will neutralize 16,000 gallons of water at Cl2 = 1 ppm, but to achieve this, it must be completely dissolved and thoroughly mixed. In a flowing situation, the rate at which a tablet will dissolve depends upon the rate at which water is flowing over it.

The capacity to neutralize depends on how much water flows per tablet. In practice, one should channel the water so that the stream flows over the full width of the Dechlormat. If the stream is more than a few inches thick, a second Dechlormat should be put in series with the first mat. If possible, collect and test a sample 20 or 30 feet down stream of the mats. This will demonstrate if more tablets/mats are required. When the tablets reach half their original size, new tablets should be added.