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AA UV3WR Clip-On UV for Aquarium Fish Tank - $20
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AA UV3WR Clip-On UV. For aquariums up to 20 gallons.
The AA UV3WR Clip On UV allows water flow in direct contact with the UV lamp, making it extremely efficient. Keep your aquarium crystal clear & reduce water changes.
Simply Clip On to your filter. Converts most filters into a UV Filter. Leave running 24/7 for the first 2 weeks. Works best with hang-on filters that have a flat or near flat water outlet 2 inches (5.5cm) wide or wider. May not work well with a filter with a curved water outlet.