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7. Top tips for choosing and using a UV unit for a garden pond

  • UV transmission. The clear tube protecting the UV lamp from the water should let through as many UV rays as possible. Check what percentage of UV rays reach the water.
  • Ease of fitting and maintenance. Fit the UV unit where it can be maintained in situ. If this isn't possible, use hand-tightened fittings for ease of removal from the system. Easy-to-remove hosetails make removal easier.
  • Electrical safety. Always use a residual current device (RCD) in conjunction with mains electrical equipment in the garden to protect against electrocution.
  • Installation. Install UV units so the water flows past it before entering the biological filter in a pump-fed system; install after the biological filter and pumped outlet in a gravity-fed system.
  • Flow rate. The maximum flow rate is usually 35 to 50 per cent of pond volume. If the flow rate necessary for the filters is too great for the UV unit, then use a T-piece to divert the surplus and bypass the UV unit. But, if you allow too great a flow past the lamp, it won't be effective at all because the water and the algae won't be exposed to the UV light rays for long enough.

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