i did some calculation before too, but dont know whether is it the correct way
maybe some bros can correct it =)
Taking 1 day 24hrs, let say 1hr kick-in 1hr kick-out, so total is 12hr of running.
12hr x 176W = 2112W = 2.112kWh
30days,
2.112kWh x 30 = 63.36kWh
electrical tariffs as of 1st Apr 2010, 23.56cents/kWh
monthly bill = 63.36kWh x 23.56 cents = $14.927










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That's incredibly low! gH is 3 and pH is at <6.0. Looks like my water is too soft! 



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