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Bog Filters: A Design, Build and Maintenance Guide
Paperback
General GardeningPets: FishWater Gardens
Publisher: Independently Published
Published: Aug 11 2026
Pages: 128
Weight: 0.29
Height: 0.27 Width: 5.00 Depth: 8.00
Language: English
BUILD A LIVING FILTER FOR YOUR POND OR NATURAL SWIMMING POOL.
Clear, chemical-free water starts with the right filtration system. This book shows you how to build one using gravel, plants and the natural biology that makes a wetland work.
A bog filter turns a planted gravel bed into a living part of your filtration system, with water slowly passing through the root zone before returning to the pond or pool.
It is a beautifully simple idea: build the right environment, get the flow right, choose the right plants, and let nature do what it does best.
For natural swimming pools, this same approach can create a regeneration zone, providing a planted area that forms part of the pool's biological filtration.
Bog Filters takes you from the first measurements to the finished system, covering sizing, gravel, flow, planting, plumbing and establishment.
THIS BOOK IS FOR YOU IF:
- You're building a pond, koi pond or natural swimming pool and want a practical approach to planted gravel filtration
- You're adding a filter to an existing pond or pool and need to understand sizing, flow and connections
- You want to build it yourself with clear measurements, materials, worked examples and straightforward instructions
WRITTEN BY SOMEONE WHO BUILDS PONDS.
Glen Merriman has around 20 years of hands-on experience building ornamental ponds, koi ponds and natural swimming pools.
He's worked with pumps, pipework, mechanical filters and biological filtration, and knows that the details matter: size, depth, flow, gravel and water distribution.
That's what this book concentrates on: the practical knowledge you need before you start digging.
INSIDE, YOU'LL DISCOVER:
- How bog filtration works, and the role of gravel, roots and beneficial biology
- How to size and build the filter, with worked examples, materials and construction details
- How to design a regeneration zone for a natural swimming pool
- How to get the flow right, choose suitable plants and connect the system
- How to establish, maintain and troubleshoot your finished filter
PLUS TWO PRACTICAL BONUSES:
Size Your Bog in Twenty Minutes
A straightforward routine for calculating a practical filter or regeneration-zone size from your own measurements.
The Clear-Water Fault-Finding Clinic
A quick reference for common water-quality problems, possible causes and what to check.
Whether you're starting from scratch or improving a pond or pool you already own, you'll finish with a clear understanding of what to build, how to build it and why the details matter.
Build the wetland. Get your flow right. Then let nature get to work.
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