Keeping Koi: Building and Maintaining Beautiful Koi Ponds

A Complete Guide to Designing, Building, and Maintaining Koi Ponds

If you’ve come this far, you can probably already imagine it.

A morning coffee by your own backyard pond. The water clear enough to watch your fish move through it. Native plants softening the edges and helping keep the water balanced. A steady flow that keeps everything clean and alive. A space that feels calm, natural, and complete.

This book shows you how to build that from the ground up.

It takes you through the full process, from design to construction, so you can plan depth, size, filtration, and flow correctly before anything is built. The goal is a pond that runs properly once it is filled, not one that needs constant correction or expensive adjustments.

Bryce Holt is a self-taught koi keeper who learned through hands-on experience and rebuilding ponds the hard way. In this book, he shares the practical decisions that matter most: sizing, filtration zones, and how to maintain stable conditions once fish are introduced.

This is a step-by-step guide to building and maintaining koi ponds in the correct order of construction.

It follows the real build process, from digging through to final setup, so each stage connects naturally to the next.

You will learn how to:

Set pond depth and shape for stable swimming space and winter protection Calculate pond volume so filtration is correctly matched to water load Size pumps and flow rates so waste is carried efficiently to filtration Design filtration systems based on actual pond requirements, not estimates Cycle a new pond before adding fish so conditions are stable from the start Introduce koi without disrupting established water balance Read fish behaviour as an indicator of water quality changes Prepare a pond for winter so temperature shifts do not destabilise the system
What’s included

Filter and flow calculator: Three worked pond examples showing pump sizing, turnover rates, and filtration setup based on real pond volumes. Step-by-step build process: A clear construction sequence from excavation and layout through to shaping the pond, installing plumbing and returns, setting up filtration, and cycling the system to start-up. Complete pond plant guide: Planting guidance for koi ponds, including planting zones, basket planting, soil choice, plant types, and seasonal maintenance. Seasonal care checklist: A one-page checklist for preparing a pond through colder months, including flow adjustments and system checks. Quick reference guide: Core pond numbers used in ongoing maintenance, including turnover rates, depth guidance, and basic water parameters. Practical examples section: Real pond sizing scenarios, common build mistakes, and clear explanations of key koi keeping terms.
Koi ponds are judged by how they perform once they are running.

If filtration is undersized, clarity gradually fades. If flow is poorly set, waste settles instead of being carried through the system. If the pond is too shallow, it reacts quickly to temperature shifts through the year.
When these elements are designed correctly from the start, the pond becomes steady. The water stays clear, movement is consistent, and the system holds its condition without constant adjustment.

A well-built koi pond is one where the water stays open and readable, and the fish remain visible as they move through it.

If you are ready to build it the right way from the start, you already know what this is.