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Standard sand/anthracite filters are typically rated at 4 gpm/sf by state agencies. I have read several references from other consultants that indicate that these filters may be converted to "high rate", thus increasing plant capacity (but no real details on how to do this). My question is...

Is anyone satisfied or dissatisfied with any particular ultrasonic level transmitter for an elevated storage tank? If anyone can point me to a generic spec for an ultrasonic arrangement, I would appreciate it. Another question: I have typically, acutally always, required an operating range for...

Something of a low-brow answer to Hot-Box. Simply can't afford them. Size is 4'x4'x4'. I realize I may have to use something other than fiberglass. Any ideas? thanks

I need to keep a 1000 gallon outdoor concrete tank from freezing down to 0 degrees F. I see most immersion heaters provide a KW rating but I don't know how to determin the power I need. thanks

Or any of the similar designations? Is there a readily accessible reference on the web? thanks

Does anyone have an equation and/or rule-of-thumb used to estimate alum sludge production in a potable water plant? Basically we're continuously removing alum sludge from settling basins and dicharging to a pair of gravity thickeners. We pump from the bottom of the thickeners to a 1 meter belt...

I'm converting a chlorine gas disinfection system to a chloramine system. Does it matter if I add the ammonia or the chlorine to the system first? thanks

Has anyone seen or had an instance where liquid hypochlorite and aqua ammonia are used to form chloramines? I've only used (or even seen) gas chlorine used with ammonia to form the chloramines (due to a high THM potential). Thanks