| http://www.w3.org/ns/prov#value | - t to establish a concentration of from 10 to 50 mg/L, of a polyether polyamino methylene phosphonate deposit control agent of the following formula: ##STR11## and optionally the N-oxides thereof, where n is an integer or fractional integer which is, or on average is, from about 2 to about 12; M is hydrogen or a cation; and each R may be the same or different and is independently selected from hydr
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