The water

Perfect numbers and the fish still look miserable?

Four readings do all the work, and most aquarium arguments are about the one that matters least. What ammonia, nitrite, nitrate and pH each tell you. Why pH crashes in soft water. And the six things sold to beginners that make a tank worse.

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A guppy over green

The one nobody tests

KH is why tanks crash overnight.

pH holds, holds, holds, then falls a long way very fast. That's the buffer running out, and a KH test would have shown it coming for weeks.

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Sound familiar?

You test the water, write down four numbers, and still don't know what to do?

A number without a meaning is just anxiety. 0.25 ammonia, pH 6.4, nitrate 40 — each of those means something specific and each has a different answer.

And the single most important parameter in the whole set isn't on most beginner test kits at all. It's KH, the buffer, and it's why tanks crash overnight after holding steady for weeks.

What you get out of it

The chemistry, without the mythology.

Most of the bottles on that wall treat a symptom. Two of them are worth owning.

What ammonia, nitrite, nitrate and pH each tell you — and which to act on first

The difference between GH and KH, and why only one of them predicts a pH crash

Why the nitrate test is the one most often misread, and the shaking that causes it

How to do a water change properly: size, day, temperature and conditioner

Mains, well, RO and rainwater — four sources, four different sets of problems

Six things people put in a tank that treat a symptom and hide the cause

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When it is a vet, not a book: If fish are dying, gasping at the surface, hanging at the top or lying on the bottom, if they have visible wounds, growths, cloudy eyes or a bloated body, if they stopped eating, or if several went wrong at once: test the water today, stop feeding, add nothing to the tank, and take the numbers and a clear photograph to a veterinarian who treats fish or a specialist aquatic shop. There is no medication in this collection and there never will be.

Reads low, reassuringly

The nitrate test everyone misreads.

The second reagent bottle contains a solid that settles. Under-shake it and the result comes back comfortably, believably low.

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What is inside

Thirty-two steps, six chapters, 44 pages

Thirty-two numbered steps, one page each, with the targets, the actions and the misreadings written down.

Inside the file

Thirty-two steps, six chapters, 44 pages

A page from the The Water Book PDF — An actual page from the PDF, at full size

The four numbers — ammonia, nitrite, nitrate, pH, temperature, and the one row in your log that does the work
Hardness and buffering — GH versus KH, why pH crashes in soft water, and matching fish to your tap
Testing properly — liquid kits, the shaking problem, reading colour without fooling yourself
The water change — why you do it at all, size, day, temperature, conditioner and the siphon
Where your water comes from — mains, well, RO and rainwater
What not to put in there — six bottles, with the reasons

Where this lands in the day

03Ammonia starts falling — The first group of bacteria is working. Nitrite appears, which is the first real milestone in the whole project.
04Nitrite climbs off the chart — Expected. The second group is slower. This is where most people give up, buy something, or put fish in.

What you get

A 44-page PDF, 6 × 9 inches

Thirty-two numbered steps, one page each, with the targets, the actions and the misreadings written down.

Steps32
Chapters6
Pages44
Format6 × 9 in

One page per step, with the target and the action printed on it
A drawn plate of the four readings and what each one means
A whole chapter on what not to add, and why
Prints on ordinary paper, reads fine on a phone

Thirty-two steps, one page each

Target, action, and what goes wrong.

Every step has the number you're aiming at and exactly what to do when you don't hit it.

Yes — I want the numbers explained — $10.00One-time payment · 60-day money-back guarantee

Four readings, what each one means, and which bottles to walk past.

A 44-page PDF, 6 × 9 inches

Thirty-two numbered steps, one page each, with the targets, the actions and the misreadings written down.

Explain the numbers$10.00one-time · 60-day money-back guarantee

60days

60-day money-back guarantee

If the ebook is not what you expected, write within 60 days and you get your money back in full. You keep the file. No form, nothing to return, and you do not have to explain why.

Important purchase information

Delivery: A digital ebook in PDF form. Right after your purchase you receive an email with a secure download link, and the same link on the page you land on. Nothing is shipped.
What it is: Educational material about keeping a freshwater aquarium. Not veterinary advice, and no promise that any fish will live.
Payment: One-time payment of $10.00. No subscription and nothing further to buy.
Refund: 60-day money-back guarantee, in full, with the file kept.

Ten dollars, once

No subscription. No upsell. No list.

One payment, instant download, and 60 days to get your money back. You keep the file either way.

Yes — I want the numbers explained — $10.00One-time payment · 60-day money-back guarantee

Questions people actually ask

Do I really need a liquid test kit?

For nitrite and nitrate, yes. Strips are fine for a rough look at pH and hardness and are notoriously unreliable on the two readings that matter most.

My pH keeps dropping. What do I add?

Almost certainly nothing. It's usually KH running out, and the answer is maintaining the buffer with water changes or a slow carbonate source. The book explains why pH bottles make it worse.

Is salt good for a freshwater tank?

Not as a routine tonic, and the book says so plainly. It has legitimate therapeutic uses, and those are treatment decisions — which means a vet or a specialist, not this book. There are no doses here.

Will this tell me what's wrong with my fish?

No. It's about water chemistry. Sick fish mean a water test, then a vet who treats fish or a specialist shop, in person.

What format is it?

A PDF, 6 × 9 inches. Phone or print.

What if I hate it?

Email within 60 days and you get your money back in full. You keep the file.

One payment, and it is yours

Four numbers, four actions

Thirty-two steps on what your water is doing and what to do about it.

Yes — I want the numbers explained — only $10.00One-time payment · 60-day money-back guarantee

This is educational material about keeping a freshwater aquarium. It is not veterinary advice, it does not diagnose anything, and it does not treat anything. There are no medications, doses or treatment protocols anywhere in this collection. Sick or dying fish mean a water test today and a veterinarian who treats fish, or a specialist aquatic shop, in person. No book can promise you that a living animal will survive.