The Optical Auto Top Up UK is a reliable, precision device for maintaining stable water levels in freshwater and saltwater aquariums. Featuring a high-quality infrared optical sensor with triple detection points, it automatically activates the included DC pump to replenish evaporated water. Ideal for sumps and display tanks alike, it offers compact installation and long-term durability.

Key Features:

• Infrared optical sensor with triple detection for accurate water level monitoring
• Dry-run protection prevents pump damage
• Magnet-mounted for easy, compact installation
• Includes 2m flexible hosing, anti-siphon valve, and hose clamp
• Energy-efficient DC pump with refill capability
• Compatible with both marine and freshwater aquariums

Box Contents: Optical sensor, DC pump, 2m 6/9mm flexible hosing, anti-siphon valve, hose clamp, PSU, and instructions. Sensor: 25 x 25mm (diam.) x 35mm, Pump: 45 x 28mm (diam.) x 38mm.

Maintain your aquarium with confidence using the Optical Auto Top Up UK—simple to install, reliable in use, and built to last.

Aquacadabra acts as credit broker/intermediary and not as a lender.

Klarna's credit products are provided by Klarna Bank AB, which is authorised and regulated by the Swedish Financial Services Authority, with limited supervision by the Financial Conduct Authority. More information can be found here.

Newpay finance options are provided through Deko’s platform by NewDay. P.D. Aquatics Ltd, t/a Aquacadabra is an Introducer Appointed Representative of Pay4Later Ltd, t/a Deko, which is authorised and regulated by the Financial Conduct Authority (ref no 728646) and is a credit broker, not a lender. NewDay Ltd is authorised and regulated by the Financial Conduct Authority (ref no 690292) and is authorised by the Financial Conduct Authority under the Payment Services Regulations 2017 for the provision of payment services (ref no 555318). More information can be found by clicking the newpay option above, or in the Newpay FAQs.

We really want you to be happy with the product that you've received. If however, when the goods arrive they're not what you want, then no problem - we have a 60 day no quibble return guarantee. Just let us know that you're going to return the item(s) by contacting us(stating your Order Number) and complete the returns packing slip that will have been included with your delivery. This will help us to quickly identify the item that you have returned (unopened and unused) - and we'll put a refund through for you.