What is Reverse Osmosis?

Unlike osmosis, which is the natural tendency of pure water to flow through a membrane into impure water. Reverse osmosis is achieved by applying very high pressure to seawater to counteract the osmotic flow.

Thus, seawater is forced through a semi-permeable membrane, which removes all the dissolved solids and produces fresh, potable water on the other side. This method rejects at least 98% of salts, contaminates, and pollutants from seawater.

Reverse Osmosis

Salt or brackish water first enters into the water-maker via a through-hull fitting and is filtered through the Sea Strainer. This feed water is then boosted to 30 psi by the Booster Pump and filtered through 25 and 5 micron Pre-filters. Oil, if present, is then separated and removed by the Oil/Water Separator. These filters remove sediments and suspended solids from the feed water prior to entering the High Pressure Pump. A Low Pressure Switch shuts down the water-maker in the event of low flow conditions, preventing cavitation in the High Pressure Pump.

The High Pressure Pump supplies the required force to drive the feed water through the semi-permeable Reverse Osmosis (R.O.) Membrane. The Back Pressure Regulator automatically controls the necessary pressure level in the Membrane Vessel Assembly. An automatic high pressure safety shutdown switch protects the water-maker if pressure exceeds recommended levels.

The fresh water produced flows out of the R.O. Membrane where it is up to 99.2% free of salts, minerals, and other ions. It then passes into the Product Flow Meter where the amount of potable water produced per hour is registered. Next, the Salinity Probe registers the salt content of the product water. If the water is good quality, it passes through the Charcoal Filter, which purifies the water of unpleasant odours and taste. Finally, the last filtration process is completed by an optional Ultraviolet Sterilizer where 99.8% of all micro-organisms, including viruses and bacteria are destroyed.

Support & Servicing

Providing you a first class service that matches the quality of our products.

Are you interested in the following...

  • Generator Service?
  • Technical Support?
  • Local contact?

Installations?  Extended 5 year world-wide warranty on marine installations carried out by Fischer Panda.


Our Product Range



The super-efficient, diesel powered generator encased in a sound enveloping capsule began life in the late 1970's and is now Europe's leading manufacturer. Fischer Panda generators are renowned worldwide for their compact design and extremely low sound emissions. Where specific requirements such as noise, weight, size and reliability are of utmost importance, Fischer Panda generators are second to none.

Find Out More

Village Marine LTM watermaker

Water Makers

HRO, Sea Recovery & VMT Water Makers, part of Parker Hannifin Group, have built a reputation for manufacturing the most reliable and intuitive systems in the world, providing a range that will suit every type of boater. Simplistic in their design, the standard systems are capable of producing between 145 - 317,000 gallons per day, so your supply of fresh water need never run out.

Learn More


Air Conditioning

The Dometic Group is a world-leading supplier of dedicated climate-control systems and equipment for leisure & commercial boats, as well as mobile vehicles. Dometic Group features Marine Air, Cruiseair systems and Condaria; the oldest names in the industry, which are guaranteed to keep you cool in the hottest climates around the world.

Learn More

100 kW electric motor (3)

Electric Propulsion

Fischer Panda UK offers an extensive range of electric motor arrangements from our chosen manufacturers, Fischer Panda & Bellmarine, which are designed to replace or provide alternatives to diesel engines in boats ranging from small launches & day boats to commercial craft. Our vast range covers inboards, outboards, pod motors and hybrid drives, ideal for new vessels or conversions. 

Learn More

7440 mliultra5500czonerv

Power Electronics

Mastervolt Power Electronics and CZone Digital Switching – part of the Advance Systems Group (ASG) - offer extremely reliable and innovative autonomous power and monitoring solutions for our key Marine, Specialist Vehicle and Military markets.

Learn More


Get In Touch


At Fischer Panda, we pride ourselves on the quality of our customer service.


We want to support you with all of your requirements so please contact us to discuss further.

Contact Form

Please fill in your details below and we will contact you as soon as possible