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Boiler water treating

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I HAVE A 220 PISG BOILER WITH AT LEAST A 70% CONDENSATE RETURN. THE RAW WATER HAS THE FOLLOWING MAKE UP

ANIONS                CATIONS        SILICA HCO3 34 mg/l          Ca 18          SiO2 35 mg/l SO4  19               Mg 30 Cl   71               Na 76

WE USE A PHOSPHATE-POLYMER BOILER TREATMENT

WE HAVE TO REPLACE OUR CURRENT WATER TREATING DEVICE. BETWEEN A SOFTNER, DEMINERALIZER OR R.O.,WHAT TECHNOLOGY WOULD THE MOST PRACTICAL? JIM C

JIM CAIRNS
macadamia processor - HILO , HI, USA

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