Mg hydroxide is primarily utilized to increase "weight" to the solids formed,
thereby improving the settling characteristics of "over-loaded" systems. 

There are products on the market that combine Mg with DTC, or other heavy ions,
to achieve this same affect.

A more cost effective, and easier approach, would be to utilize
"solids-recycling" from your sludge holding tank to your primary reaction tank.
This will provide, the "weight", to improve your settling, as well as, reduce
your DTC, flocculant, and alkalinity requirements by 20-50%. Also, this will
allow you to use sodium hydroxide, in place of, Mg, or Ca Hydroxide (cost/ease
of use savings).


Rick Miller

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