Sol One Water Guide: Ice, Recycling and a Reserve That Lasts

Water is the quiet resource in Sol One. Oxygen gets the warning lights and power gets the dramatic failures, but water is the input that decides how big your base can get. It feeds you, it feeds the crops, and in most survival designs it also feeds the machine that makes breathable air. When water is short, everything downstream is short.

This guide covers the water chain: finding ice, building a reserve, running a recycler, and budgeting water across the three systems that want it.

Water sources

Sol One's resource list includes ice, and the map is a full-scale Mars with polar and subsurface ice. That makes ice the primary water source, with two practical forms:

• Surface or near-surface ice — fast to reach, usually the first supply.
• Subsurface deposits — more capacity, more digging, better once you have a rover and a proper mining setup.

The early game is therefore a question of where you landed. A base next to ice is a base that can grow. A base on a dry plain is a base with a commute.

The three consumers

Water in Sol One is not just drinking water. Three systems draw on the same reserve:

1. You. Thirst is a life sign, and it is usually the first meter to become urgent.
2. Crops. Every farm plot is a water demand, and a greenhouse full of crops can outdraw a small base's entire supply.
3. Life support. If oxygen production runs through ice processing, your air supply is also a water customer.

That third one is easy to miss. If ice feeds both the water tank and the oxygen processor, then a water shortage is an air shortage with a delay. The life-support loop→ explains the dependency in detail.

Budgeting by priority

When water is tight, spend it in this order:

• Drinking water for the character.
• Oxygen production, if it depends on ice.
• A reduced crop set — keep the seed stock alive, let the surplus plots go fallow.
• Everything else.

Do not let a full greenhouse drink the reserve dry. Crops can be replanted; a dead character cannot.

Building a reserve

A water reserve is a tank, a pump and a place to put the tank. The design questions are how big and where.

How big: enough to cover one failed supply trip plus a few days of drinking. If your ice run takes half a day, the tank should hold more than half a day of total demand, or you are one storm away from rationing.

Where: inside or adjacent to the habitat, close to the recycler and the greenhouse. Water is heavy; every metre of pipe is a place to freeze, leak or lose pressure.

Recycling

A recycler closes the loop between what you drink and what you need to produce. It does not create water; it recovers a fraction of what you spend. That distinction matters for planning:

• A recycler reduces the net draw, which extends a reserve.
• It does not remove the need for a source.
• Its recovery rate is the number that decides how large your ice runs must be.

If the build gives you a recovery percentage, use it to compute net demand: gross demand × (1 − recovery) = water you must supply. If it does not, measure it — fill the tank, run the base for a day with no ice input, and see how far the level falls.

Recycling and the greenhouse

Crops transpire. In a sealed greenhouse, that moisture is either recovered by the life-support system or it condenses on the wrong surface. A greenhouse attached to the recycler is more efficient than a greenhouse with its own independent water supply, because the loop captures what the plants give back.

This is also why greenhouse humidity is a design problem, not just a gardening one. A sealed room full of wet soil and grow lights is a lot of water vapour in a small volume.

Ice runs

The ice run is the defining early-game chore. Make it efficient:

• Go with a full tank and an empty cargo hold. You are bringing water back, not sightseeing.
• Mine more than you need for the trip. The marginal cost of extra ice is small; the cost of a second trip is a whole day.
• Use the rover as soon as you have one. The Crawler's cargo capacity turns a multi-trip walk into a single haul.
• Mark the deposit. A beacon on the ice field is the cheapest logistics upgrade in the game.

Water and power

Every part of the water chain is a power load: pumps, the recycler, heating the tank, lighting the greenhouse. A water system that works in daylight can fail at night if it is not on the critical circuit.

Put the recycler and the tank heater on the same priority tier as oxygen. A base that keeps breathing but freezes its water supply is still a base that loses.

A working water plan

For the first two weeks:

• One ice source within a short drive, marked with a beacon.
• One tank sized for at least two days of total demand.
• One recycler running continuously on the critical circuit.
• A greenhouse sized to the water budget, not to the available floor space.
• A reserve of bottled or stored water in the suit room for emergencies.

That plan is deliberately modest. It is easier to add a second tank than to recover from a base that grew past its water supply.

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FAQ

Can I drink directly from the recycler? Recycled water is part of the potable supply in the game's survival loop. The practical concern is throughput, not purity: the recycler has to keep up with the character and the crops.

Does ice respawn? Deposits are finite per site in most survival designs. The map is large enough that this is a logistics question rather than a scarcity one, but do not build a base that depends on a single small deposit forever.

Why is my water dropping when nothing is running? Check the greenhouse and the oxygen processor first. Both can draw water passively. Then check for a leak or an open tap in the tank system.

Should I build a second base near ice? A forward mining camp is often better than moving the main base. A small sealed shelter, a tank and a charging point turn a long commute into a short one.

How much water should I carry on an expedition? More than you think. The return leg is always slower, and a dust storm can double it. Fill the suit reserve and put a spare in the rover.