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Raw Materials:

Water Spinach Stalks

35 days growing time (average 5 weeks)

4-6 weeks ideal harvest after cutting (shoot harvesting)source: Department of Environment and Primary Industries, 2012

945 stalks per system * systems ! "#9$ stalks

" day maintenance for the hydroponics systems every 35 days for harvesting and cleaning%um&er of hydroponic system shutdowns per year ! 365'(35 ") ! "$"4 ! 10 harvestingperiods/year

nnual +hutdown,3 days allotted for overall plant maintenance " water spinach replanting ! 4 days

otal .orking days per year,365 / 4 / "$ ! 351 days

Electricity ons!"ption:

CEPALCO rating !an"#e$ 201%$$ 0h0'k.h

#or Pump 'an(1orte2 0ump ! 6$$ . 0ower rating 64" hours of use per daynergy consumed per day, 3#46"5 k.h'daynergy consumed per year, "4$3#5 k.h'year ! ""56"" 0h0'year

#or )ydroponics *ystem

or ydroponic +ystem ! 6$$ . 0ower rating 4 hours of use per daynergy consumed per day, "44 k.h'daynergy consumed per year, 556 k.h'year 2 units ! "$5"k.h'year ! ##576#3 0h0'year

otal lectricity 8ost per year, #$13$%#4 &h&

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&!rchased/'a(ricated E)!ip"ent ost:

*ydroponics Syste"3 018 pipe0rice ! 359:'m (;< agle 8atalogue $"5)

" chemical hose &raided0rice ! 769975:'piece (+ournal ?stimating costs for treatment plant construction (@asimet al "99)+Certain reduction percentages are appied since ony t-e manufactured e.uipment costcomponent is ta(en into account/Sand 'ilters:

2 ! 49" m(from eAuipment design calculations 5 m diameter)Per e.uipment cacuation:Deduct 1% " contingency misceaneous&Bravity filter structure88 ! 354#342$59"e$$$$"62($C)88 ! 9$93557($)($#5) ! "5459$5:

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0rice ! 7$: (average price)

,epreciation: (0eters et al "96#) Eepreciation (depends on life period salvage value and method of calculation- a&out

"$C of i2ed-capital investment for machinery and eAuipment and -3C of &uildingvalue for &uildings

nnual cost of Eepreciation for =nstrumentation G 8ontrols piping electrical eAuipmentand