TUNZE Osmolator® Universal 3155 – Advanced Automatic Water Level Controller

The TUNZE Osmolator® Universal 3155 is a premium automatic top-off (ATO) system designed to maintain a constant water level in freshwater and marine aquariums. By automatically replacing evaporated water, it helps preserve stable salinity and water parameters, creating a healthier environment for fish, corals, and other aquatic inhabitants.

Featuring a highly accurate optical infrared sensor for day-to-day water level monitoring and an independent safety float switch for backup protection, the Osmolator® 3155 delivers exceptional reliability and peace of mind. The system comes complete with a low-voltage metering pump, controller, hose, magnetic mounting hardware, and power supply, making installation quick and straightforward.

Key Features:

• Automatic Water Top-Off: Replaces evaporated water to maintain a consistent water level.
• Dual-Sensor Safety System: Optical infrared sensor with independent float switch backup for enhanced reliability.
• Stable Aquarium Conditions: Helps maintain salinity and water chemistry in marine and freshwater systems.
• Complete Ready-to-Use Kit: Includes controller, metering pump, hose, magnet holder, and power supply.
• Versatile Installation: Suitable for sump tanks, reef aquariums, cabinet filtration systems, and aquarium edges.
• Low Maintenance Operation: Reliable performance with minimal user intervention.

The TUNZE Osmolator® Universal 3155 is widely regarded as one of the most dependable automatic top-up systems available, helping aquarists maintain optimal water levels with precision and ease.

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.