PondPoise
The Journal
How Big Should Your Goldfish Pond Be? A Volume & Sizing Guide
Volume is the number every other pond decision depends on. Here's how to think about size, depth, and shape before you dig, with a worked example.
Goldfish vs Koi: Which Pond Fish Is Right for You
Goldfish and koi look similar at a glance but differ enormously in size, space needs, and lifespan. Here's how to decide which one fits your pond.
How Many Fish Can Your Pond Actually Hold? Stocking Density Explained
The gallons-per-inch rule is the standard way to check stocking density. Here's what it means, where it comes from, and what can shift it.
Pond Filtration 101: Choosing the Right Pump and Turnover Rate
A pond filter's job is to keep up with your fish's waste. Here's how mechanical and biological filtration work, and how to size a pump correctly.
What and How Much to Feed Goldfish and Koi Through the Seasons
Goldfish and koi are cold-blooded, so feeding needs to track water temperature through the year, not a fixed daily routine. Here's how.
Water Changes 101: How Much, How Often, and Why It Matters
A running filter doesn't remove everything from pond water. Here's why partial water changes are still necessary, and how to size one correctly.
Choosing and Sizing a Pond Liner: A Beginner's Guide
A flexible liner is the most common way to build a garden pond. Here's how to choose a material, size the sheet correctly, and install it well.