[ Process Control Tools ]

The Operator's
Digital Toolkit

Free calculators, reference tables, and field guides for wastewater treatment plant operators. No account required. No paywall. No ads. No vendor agenda.

Open Calculators Reference Tables
12+ Calculators
·
4 Reference Tables
·
5 Field Guides
·
Free & Open Source
[ Toolkit ]

What's in the toolkit

Every tool built from field experience. No fluff, no paywalls — just the math and reference data you need on the floor.

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Calculators
12 tools
Activated sludge, hydraulics, solids handling, and digester operations — with live results as you type.
  • SVI & Settleability
  • F/M Ratio, MCRT, RAS Rate
  • HRT, WOR, Surface Loading
  • Chemical Dosing, Mass Loading
  • VSR, VS Loading, Digester DT
Open Calculators →
◎
Reference
4 tables
Quick-access process data organized for field use — DO targets, pH ranges, loading benchmarks, conversions.
  • DO Operating Ranges by Zone
  • pH Targets by Process
  • Loading Rate Benchmarks
  • Common Unit Conversions
View Reference →
⌬
Field Guides
5 guides
Practical guidance for common operations and troubleshooting scenarios — written the way it should have been explained earlier.
  • Plant Startup Procedures
  • Upset Response Protocols
  • Seasonal Adjustments
  • Dewatering Operations
  • Digester Management
Read Guides →
[ About ]

Built for
operators,
not vendors

Every calculator here is one I use on shift. Every reference table is something I've had to look up enough times that I finally put it somewhere permanent.

A lot of "technical resources" in this industry are vendor documentation dressed as neutral information — everything from equipment manuals to "educational guides" is ultimately trying to sell you chemicals, equipment, or consulting. This site exists outside that model. No vendor relationships, no affiliate links, no content that exists to sell you a product.

Written by an operator, for operators. Free, open source, and built to work on a phone in the middle of a process upset.

About the builder and how to contribute → Step-by-step contributing guide →