Fresh Water Reservoir
The reservoir
	The reservoir is a polyethylene container measuring 24" wide X 48" long X 54" high.  It holds 270 gallons if filled to the top.  They are usually quite expensive but I was able to get this one for about half price as a second.  Filled with water the sides bow out several inches so a 2X4 brace was added to the top for support.
Water fill
	Water is added via a toilet bowel style float valve.  A simple ball valve allows the water fill to be shut off for cleaning etc.  Approximately 1500 gallons per day enters the main 3000 gallon system via this reservoir.  A gallon meter is in line to monitor the amount of water entering the system.
Flow to tanks
	Water from the reservoir enters the main hatchery via gravity flow.  It passes through a gate valve which is a modified lawn irrigation valve, and a solenoid valve which acts as a safety cutoff if the electricity goes out.  Water flows through 1" PVC and enters the hatchery into one of the bottom reservoirs close to the filter intake.  It is also at the opposite end of the system from the water overflow which goes to the old water sump.
Dechlorination
	Luckily my local water supply uses simple chlorine and not chloramines.  Standard dechlor, sodium thiosulfate is mixed in water in a 5 gallon bucket.  Enough is added to last about 10 days or 15000 gallons of fresh water added.  The dechlor solution is slowly added to the reservoir via a dosing pump.  This one started life as a tube feeding pump for human patients that require feeding via a tube placed directly into their stomachs or intestines.  It is set to run at 70 cc/hr and runs 24/7.