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Heat tune up for 75KBTU natural gas furnace. Inspected burners, heat exchanger and ignitor. Checked filter and drain. Checked pressure switches and components. Checked gas pressure. Measured temp rise and static pressure. Combustion draft test:Good Performed water hardness test. Result: 8 grains per gallon. This is on the low level of the hardness range. 2 person household. Chart calls for softener model NVO485-75 EFT20. Provided estimate for softener/filtration system.