Daley Ponderings

I was searching for Noah's first word on our blog (I found his first signed word: please, but I couldn't find his first spoken word) because Faith has started talking a little, and I don't know exactly what her first word is, probably "hi".  But, today, she has repeatedly said, "tada" when putting a bit of a puzzle together.

While searching for that, I came across an old post where I had posted some word problems for you to solve.  And today, I have another:What method is the best (considering cost) for purifying a drinking water system that occasionally gets coliform bacteria in it?  Your answer should be expressed in terms of:

G = desired gallons per minute (I can't decide between 6 or 8)

C = preference to not put chlorine in the system (which then needs to be filtered out later, with various disposable parts)

B = number of coliform bacteria colonies (I don't know if this number is relevant to your answer)

T = temperature of the water at the output of an ultraviolet solution (should you decide to go that route)

W = wattage of the ultraviolet light

H = hardness of the water, and consider whether the water is too hard for proper ultraviolet cleaning, or if our water, though hard (13-17 grains per gallon) seems to not build up scale very much

$ = cost of the ultraviolet system ($1000 - $1500)

S = Cost and value of an automatic shut off solenoid valve for power outages, to avoid contaminated water going past the light when it is off.

I = Cost and value of a light intensity meter which watches the light and effectively measures the scale build up to know how often it must be cleaned.

E = Cost and value of a nifty gadget that has an ethernet jack on it, which allows for connection to the network, for easier monitoring, graphing, etc.

For bonus credit you can add in other variables affecting available brain power for decisions such as a wife with a flu/possible sinus infection, a new wood stove that needs a chimney liner, and a pile of wood to be stacked outside in the rain.