Bleach Stone

Bleach Stone is a solid element that slowly releases Chlorine Gas as it evaporates. It appears in the game as both a naturally produced/excreted material and as a manufactured product. Puft Princes and Squeaky Pufts excrete Bleach Stone, and it can also be manufactured on-base by the Bleach Stone Hopper. Bleach Stone is harvestable on certain Space POIs (notably Chlorine Clouds and Radioactive Asteroids) and functions as a convenient local source of Chlorine for sterilization, plant growth, critter baiting, and other systems that consume or require Chlorine.

The Bleach Stone Hopper produces Bleach Stone by consuming Salt and Gold. Its documented recipe takes 40 seconds and uses 30 kg Salt + 500 g Gold → 20 kg Sand + 10 kg Bleach Stone. Unlike methods that require Chlorine input, this production path generates Bleach Stone (and thus Chlorine over time) without needing existing Chlorine gas, making it useful on planets without Chlorine Geysers. The hopper ejects its products in multiple small packages (roughly 2000 g each) and tosses them outward from its top, so output lands across multiple adjacent tiles rather than a single tile.

Bleach Stone is used directly by several buildings and processes: Hand Sanitizer consumes 70 g per use; Waterweed domestic growth requires 500 g/cycle of Bleach Stone; it is a valid bait in Airborne Critter Bait to attract Puft Princes and Squeaky Pufts; Hot Tub recipes require Bleach Stone; and Geotuners require Bleach Stone when geotuning water vents and geysers. Because Bleach Stone converts to Chlorine Gas when exposed, it functions as a portable, slower-release Chlorine source for sterilization rooms and plant chambers (for example, Balm Lily growth), though very large continuous Chlorine demands (e.g., mass-scale Dasha Saltvine cultivation) may require vast quantities.

Bleach Stone converts to Chlorine unless its environment prevents evaporation. Recommended storage and handling practices:

• Store in an airtight room or containment to prevent uncontrolled Chlorine release.
• Bleach Stone will not convert to Chlorine if the tile is surrounded by high-pressure gas mass (about 1800 g/tile), so a pressurized Carbon Dioxide pit or other dense gas pit can safely hold it.
• Submerging Bleach Stone in a liquid tile with sufficient mass (in a container or as debris) also prevents evaporation.
• A practical automation trick is to use an Automatic Dispenser to drop Bleach Stone into a 1-tile deep pool of Water, set the dispenser to sweep-only, and have an Auto-Sweeper collect as needed; this avoids continuous surface evaporation but requires covering all possible landing tiles to ensure suction pickup and to avoid the Auto-Sweeper repeatedly collecting tiny masses.
• Because the Bleach Stone Hopper throws output across multiple tiles, plan sweep and storage coverage for every potential landing spot; scheduling sweeper operation periodically reduces time wasted picking up many small piles.

Bleach Stone can also be obtained via Space POI harvesting: in Chlorine Clouds it yields large quantities (roughly 405–1215 kg/cycle), while Radioactive Asteroid Fields provide smaller amounts (around 9.1–36.4 kg/cycle). The material’s ability to produce Chlorine makes it an important on-base resource for creating localized sterile atmospheres or for systems that require Chlorine but lack native Chlorine vents.