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Pond & pool guides
Worked explanations of the numbers behind ponds and pools — each paired with a calculator.
- How to measure the volume of an irregular pondStep-by-step average-depth method for natural, kidney and free-form ponds: where to measure widths and depths, worked examples and how accurate it is.
- Pond pump sizing: flow rate, head height and turnoverHow to choose a pond pump: turnover per hour for plant, goldfish and koi ponds, why head height and pipe size cut the box flow, and a worked example.
- How to size a pond linerThe pond liner formula — length + 2 × depth + 2 × overlap — with worked examples in feet and metres, what to do about shelves, curves and slopes, and underlay.
- Koi pond depth and volume: how big should it be?Minimum depth and gallons for a koi pond, how many koi per 1,000 gallons, what pump turnover and filtration koi need, with volumes for common pond sizes.
- Pool turnover rate explainedWhat pool turnover is, how to calculate turnover time and the GPM needed, how long to run a pool pump, and how variable-speed pumps change the answer.
- Pool chlorine basicsFree vs combined chlorine, typical ppm targets, how stabilizer and pH change chlorine, how to work out a dose for your pool size, and safety rules. Guidance only.