Two 24w PLL 4-pin UV replacement bulbs supplied as a twin pack for pond and aquarium UV sterilisers

AllPondSolutions Replacement 24w PLL UV Bulb Twin Pack

£24.99 Free UK delivery

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£24.99

About the Replacement 24w PLL UV Bulb Twin Pack

Two 24w PLL UV bulbs in one delivery. A UV lamp is an annual consumable, not a one-off purchase. Buying two at once means one delivery charge instead of two, and a spare already on the shelf when the water turns.

Dimensions: 320mm overall length · 4 pin fitting

Contains

  • 2 x AllPondSolutions 24w PLL UV bulb, 320mm, 4 pin

Cheaper than buying them one at a time, and one delivery instead of two.

Specification

  • 24w PLL germicidal UV-C lamp
  • 320mm overall length
  • 4 pin fitting
  • Average lifespan approximately 9,000 hours
  • Suitable for pond and aquarium use

Fits our own brand

AllPondSolutions CUV-224 steriliser. Also fits all major manufacturers' units - measure your existing bulb end to end and check it against 320mm before ordering.

When to replace it

A UV bulb stops working long before it stops glowing. The visible light remains while the invisible UV-C output fades, so a lamp that still lights up can be doing nothing for your water.

  • Sterilisation: replace every 6 months (approximately 4,000 hours)
  • Pond or aquarium clarification: replace every 12 months (approximately 8,000 hours)

On a 6 month sterilisation cycle, two lamps is a full year of cover. Clean the quartz sleeve at every change - see our UV Steriliser Maintenance Guide.

Delivery & returns
Tracked 2–3 daysFREE
Tracked 1–2 days£4.00
Courier next day£6.00
30-day returnsEasy online returns

Order before 3pm Monday–Friday for same-day despatch. Pallet items: UK mainland 3–5 days FREE, kerbside delivery. Full delivery & returns policy

Frequently asked questions

How often do UV bulbs need replacing?

Every 6 to 12 months. A UV lamp keeps lighting up long after its useful output has gone, so a bulb that looks fine may no longer be clearing your water at all. Most pond keepers fit a new one at the start of each season.

Will these bulbs fit my unit?

Match two things to the title above: the wattage, and the pin type. PLS bulbs are 2 pin and PLL bulbs are 4 pin, and they are not interchangeable. Both are usually printed on the old bulb itself or on the ballast label of your unit.

Why buy a multipack?

It works out cheaper per bulb than buying one at a time, it arrives in a single delivery, and it means the spare is already on the shelf when the water starts to green up rather than several days away.

Should I replace the quartz sleeve at the same time?

Ideally yes, once a year. The sleeve is the glass tube the UV light passes through, and once it scales or clouds it blocks the output of even a brand new bulb. Our UV Service Kits pair the correct bulb and sleeve for each model.

How should I handle a new bulb?

Isolate the power before opening the housing, and avoid touching the glass with bare fingers. Skin oils create hot spots that shorten the lamp's life. Never look directly at a lit UV lamp outside its housing.

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