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River-treatment-iconEco cost River Sewage Treatment Plant Eco logo
Riverclean
Construction Cost Credits-icon10,000 · Tools 40 · Wood 20 · Glass 25
Maintenance Cost Ecobal-icon +300 ·  Balance -200 · Energy -250
Size 1 River Slot
Hitpoints 4000
Unlock 1400 Eco Executives

The River Sewage Treatment Plant is the ultimate Ecobalance building. It raises the ecobalance by 300, and also does not have an influence area (although it does takes up a river slot), meaning it can easily be combined with other ecobalance buildings. However, because the Guardian and Keeper have the same energy cost of the Treatment Plant but increase the Ecobalance by 500 instead of 300, they are excellent replacements for the River Sewage Treatment Plant.

Upgrades[]

Type Quality Icon Name Effect Description Costs

Ark Item Gold star small River sewage treatment plant itemUpkeep cost Self-cleaning particle filter Maintenance: -10% Avoids lengthy maintenance periods. Credits-icon 4,000 · Microchips 15 · Worker Drone 1

Ark Item Gold star small River sewage treatment plant itemEnergy cost Organic adsorption Energy: -30% Uses natural accumulation processes. Credits-icon 16,500 · Licenses-icon 350 · Carbon 35 · Microchips 50 · Control Module 1 · Generator 2

Ark Item Gold star smallGold star small River sewage treatment plant itemMultiple effects Nanofiltration plant Maintenance: -20% Energy: -40% Full particle blockage - thanks to pressure-driven membranes. Credits-icon 31,500 · Licenses-icon 650 · Carbon 65 · Microchips 95 · Generator 5 · Worker Drone 3 · Organic adsorption 2

Ark Item Gold star smallGold star smallGold star small River sewage treatment plant itemMultiple effects Reverse osmosis process Maintenance: -30% Energy: -50% Simpler filters through pressure differential. Credits-icon 41,500 · Licenses-icon 850 · Carbon 85 · Microchips 125 · Advanced Turbine prototype 1 · Nanofiltration plant 3

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