River-treatment-icon.pngEco cost.png River Sewage Treatment Plant Eco logo.png
Riverclean.JPG
Construction Cost Credits-icon.png10,000 · Tools 40 · Wood 20 · Glass 25
Maintenance Cost Ecobal-icon.png +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[edit | edit source]

Type Quality Icon Name Effect Description Costs

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

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

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

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

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