Probably Stolen Water Purity Calculator

What purity will a blend have?

Enter both batches in milliliters and their tested purity percentages. The larger batch contributes more to the result. This calculation keeps the contaminants already present; adding clean water changes their concentration rather than removing them.

Blend two water batches

Use the same volume unit for both batches. Purity is weighted by volume. Blending is not filtration.

Batch A volume (ml) Batch A purity (%) Batch B volume (ml) Batch B purity (%)

Calculate Reset Try example

Example values illustrate the formula; replace them with your batch and machine readings.

Enter your batch measurements to see the result.

The formula is:

Blended purity (%) = (volume A × purity A + volume B × purity B) ÷ (volume A + volume B)

Contaminants (ml) = combined volume × (1 − blended purity ÷ 100)

For example, 750 ml at 98% mixed with 250 ml at 100% makes 1,000 ml at 98.5%, containing 15 ml of contaminants. Use the same unit for both volumes and test the result in the game before labeling it.

What would one purifier cycle change?

Enter the container volume, current purity, the contaminant volume you want to model and the machine’s Max Purity. The cap starts at 99% for an unmodified purifier. The revised purifier’s tooltip provides the cap and a last-night removal reading. You can use a measured reading as a scenario input while allowing for different removal on the next cycle.

Plan a purifier cycle

Enter the removal amount you want to model and the Max Purity shown by your current machine. This is a single-cycle scenario, not a fixed nightly rate.

Purifier cap preset No Quality modules (99%)Quality bonus +100 (99.9%)Quality bonus +200 (100%) Custom tooltip value Player-tested purifier caps. Edit Max Purity to match your machine.

Batch volume (ml) Current purity (%) Contaminants converted in this cycle (ml) Machine Max Purity (%) Performance bonus (%) — budget estimate only

Calculate Reset Try example Use estimated removal budget

This estimate covers a powered machine with removable contaminants. You can replace the budget with your last-night removal reading.

Example values illustrate the formula; replace them with your batch and machine readings.

Enter your batch measurements to see the result.

The editable presets use player-tested caps after the purifier rework: 99% without Quality modules, 99.9% at +100 Quality, and 100% at +200 Quality. Match the preset to the machine’s total Quality bonus, then adjust Max Purity if its tooltip shows a different value. Performance starts at 0%. Enter a measured removal amount, choose the arithmetic example, or select Use estimated removal budget.

How is the revised removal budget estimated?

In Steam build 26284217, the revised purifier uses this approximate budget in milliliters:

Budget ≈ (25 + 0.003 × min(volume, 10,000)) × max(0, D + Performance ÷ 100) × 1.25

Use actual liquid volume, and enter a +50% Performance bonus as 50. The initial purity determines D by linear interpolation between these points; outside the range, D stays at the nearest endpoint:

Initial purity (%)	D
37.5 or below	20
62.5	15
80	10
88.5	5
94	2
98 or above	1

For 1,000 ml at 98%, with Performance 0%, the budget is 35 ml. The unmodified 99% cap only allows 10 ml to become water, leaving 10 ml of contaminants. This assumes the remaining components can be removed and the machine has enough power. The calculator displays decimal milliliters; the game works in whole microliters. Replace the removal field with a measured amount when component eligibility limits the cycle.

How does the cap limit a cycle?

The formulas are:

Initial contaminants = volume × (1 − current purity ÷ 100)

Room below cap = volume × max(0, cap − current purity) ÷ 100

Converted amount = min(entered removal, initial contaminants, room below cap)

Resulting purity = current purity + 100 × converted amount ÷ volume

The model preserves batch volume when contaminants become water. It never lowers water already purer than the entered cap, never removes negative contaminants and never raises purity above 100%.

How should you use this after 1.0.0.2?

Hotfix 1.0.0.2 reworks Water Purifier behavior. The budget estimate uses the revised whole-batch cap and initial-purity model. Removal and cap remain editable; composition and machine modules can change what actually happens overnight. Recalculate from the next morning’s reading before planning another cycle.

Use the purification guide for the handling sequence. The recipes and items table lists equipment roles and values. If an upgrade changes the tooltip, edit the cap and removal field before comparing another scenario.

Sources

• Official purifier rework