---
title: "Field notes: reading and restoring water | Alchemal"
url: "https://alchemal.com/field-notes/"
description: "Notes from the water's edge: diagnostics, restoration records, and nanobubble science, from the people doing the measuring."
source: "Alchemal — alchemal.com"
---
# Field notes

Working notes: how to read your water, what our restorations record, and what the science does and doesn't show.

- The operator's desk

  ## [How to read a raceway's overnight oxygen log](https://alchemal.com/field-notes/reading-a-raceway-overnight-oxygen-log/)

  The overnight dissolved-oxygen log records the after-dark draw and the pre-dawn sag. Reading it is how you see a fish kill coming.

  July 12, 2026
- Understanding your water

  ## [How to read an ORP curve on a working lagoon](https://alchemal.com/field-notes/reading-an-orp-curve-on-a-lagoon/)

  Oxidation-reduction potential (ORP) tracks the chemistry behind a lagoon odor: a negative curve means sulfide, a rising one means the smell is receding.

  July 12, 2026
- Nanobubble science

  ## [Where aeration's electricity actually goes](https://alchemal.com/field-notes/where-aeration-electricity-goes/)

  Aeration is the largest power draw at most plants, and much of it buys oxygen that never dissolves. Transfer efficiency is the physics behind the bill.

  July 12, 2026
- Understanding your water

  ## [Why stored irrigation water goes flat](https://alchemal.com/field-notes/why-stored-irrigation-water-goes-flat/)

  Warm, still storage strips the oxygen out of irrigation water two ways at once, and the bottom-drawing intake sends the flattest water to the root zone.

  July 12, 2026
- Seasons of water

  ## [Fall turnover: why ponds flip in September](https://alchemal.com/field-notes/fall-turnover-explained/)

  Every fall, stratified ponds mix top to bottom in a day or two. Here is the mechanism, why fish are sometimes lost overnight, and what softens it.

  July 8, 2026
- Nanobubble science

  ## [How small is a nanobubble, and why the size is the point](https://alchemal.com/field-notes/how-small-is-a-nanobubble/)

  Under 200 nanometers, a bubble stops behaving like a bubble: no rising, no bursting. The physics of why size changes what oxygen can reach.

  July 8, 2026
- Understanding your water

  ## [How to read a dissolved-oxygen curve](https://alchemal.com/field-notes/how-to-read-a-dissolved-oxygen-curve/)

  The one chart that explains most pond problems: what a healthy daily oxygen cycle looks like, and the three shapes that mean trouble.

  July 8, 2026
- The operator's desk

  ## [The algaecide ledger: an exercise with your own invoices](https://alchemal.com/field-notes/the-algaecide-ledger/)

  No prices from us, just a worksheet: total your own treatment invoices by year and watch the direction. The trend is the argument.

  July 8, 2026
- Understanding your water

  ## [What pond muck is made of, and why it matters](https://alchemal.com/field-notes/what-pond-muck-is-made-of/)

  Muck is two different materials mixed: organic backlog and mineral silt. The split decides whether it can be digested or has to be hauled out.

  July 8, 2026

## Tell us what your water is doing.

A specialist reads your description and replies in writing: what it usually means and what we would measure first.

[Get a free assessment](https://alchemal.com/assessment/)