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Ever more marine and freshwater fishkeepers use reverse osmosis (RO) to produce high quality water. Dave Wolfenden explains how RO units work and how to use them safely. Several components comprise an RO unit. Let's look at the function of each one:MembraneThe semi-permeable membrane acts as an ultra-fine filter, straining virtually all unwanted constituents from the mains supply and allowing only water molecules to pass through. This part is expensive and easily damaged, and some high-output units may have multiple membranes.Flush valveSome models incorporate a flush valve which bypasses the flow restrictor. This allows deposits to be washed from the membrane, improving efficiency, output and lifespan. Flush valves can be retrofitted to most systems.Flow restrictorThis valve allows pressure to build up in the system — essential for reverse osmosis to take place —while allowing water through above a certain pressure, preventing the system leaking or blowing apart.Product water outlet'Product water' is 'cleaned' tapwater for the aquarium and an efficient RO unit can remove 90% or more of tapwater contaminants.
Regularly test it with a TDS (total dissolved solids) meter or a GH (general hardness) test kit to check if the unit is working correctly. Product water should have a TDS of 10ppm or less and a GH of zero.Waste water outletThe waste water has elevated levels of nitrates, phosphates, heavy metals, pesticides and other nasties and shouldn’t be used in the aquarium. Don’t waste any of this water though, as your garden plants will love it!Pressure gaugeThis allows the pressure of the mains water entering the membrane to be monitored. Insufficient pressure will reduce unit efficiency, or prevent it working altogether. Not all units have a pressure gauge, but they can be retro fitted.PrefiltersPlaced before the membrane, these are essential. They remove sediments, chlorine and other components of mains water which would rapidly block and/or destroy the membrane. Our tapwater is subject to strict quality guidelines, but, even so, contains substances our aquarium’s inhabitants wouldn’t like.
It relies on extremely fine membranes, made from Thin Film Composite (TFC) materials to strain unwanted dissolved chemicals, including nitrates, phosphates and heavy metals such as copper, leaving only water.
marine aquarium fish for sale in mumbaiThis needs to happen under pressure, against the osmotic gradient of the water — hence 'reverse' osmosis.
sand for aquarium ebayNormally, water would pass across a membrane from low to high solute concentration, but, in the case of reverse osmosis, the opposite happens.
soil for aquarium in indiaThe purified (or 'product') water can then be used in the aquarium, while the waste water, which has concentrated the contaminants, can be discarded or used for your garden plants.
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The ratio of product to waste water varies, depending on various factors, but expect to waste around 5 l/1.1 gal of water to produce 1 l/0.2 gal litre of product.
t5 aquarium light 36Before the water can pass through the membrane, it needs to be prefiltered to remove sediments and chlorine which would otherwise rapidly destroy the membrane’s delicate TFC materials.
t5 aquarium light bulbsThe prefilter media needs to be changed regularly, as failure will compromise the efficiency and life of the membrane.
t5 aquarium light fixturesThe performance of any RO unit depends on several factors, notably temperature and pressure of the mains water.
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Lower temperatures tend to decrease output and a minimum pressure of around 2.8 bar (40psi) is needed. Lower and it’s unlikely that much product water will be made and, in such cases, a booster pump will be necessary.
sir zhed roHowever, most domestic mains supply pipes in the UK have adequate pressure.
t5 aquarium lighting retrofitInstalling an RO unit needn’t require the services of a professional plumber.
toy fish aquarium reviewsA simple screw-in saddle tap can be fitted to the coldwater mains pipe to supply the unit and a drain clamp can be fitted to any plastic domestic drainpipe to run away waste water.
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Using ROUsing RO water is a doddle for marine aquarists. Simply use the product water to make up a salt mix and the neat RO can be used for freshwater top-ups without needing additives.
virtual fish tank builderMany marine aquarists, and reefkeepers in particular, would consider an RO unit mandatory, as the levels of nitrate, phosphate and silicates in untreated mains water can lead to persistent problems with nuisance algae.
virtual fish tank for wallIf not already using RO for your marine system, seriously consider it.
virtual fish tank games free onlineThings aren’t as straightforward for freshwater aquarists and it’s important to appreciate that neat RO water can be lethal for fish!
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Because it’s nearly pure water, it has zero KH (carbonate hardness).This means that its lack of buffering capacity makes it prone to drastic pH swings.
cheap aquarium cooling fanIts lack of minerals also plays havoc with fishes’ osmoregulatory systems, as well as creating a poor environment for plant growth and development of the biological filter’s microbial communities.
cheap 55 gallon aquarium standsPure water is too sterile and potentially unstable for aquatic life, but can be a ‘blank canvas’ for chemical fine-tuning to create just the right conditions for the aquarium’s inhabitants.
cheap designer fish tanksIf wishing to keep very sensitive soft water species, for example, RO is the way to prepare water.RO water needs to be remineralised and there are two approaches.
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The first involves adding a certain amount of mains tapwater, preferably to which a water conditioner has been added, to RO water to achieve the desired hardness and pH.
cool fish tanks pinterest Adding tapwaterIt seems bizarre to add tapwater to RO after we’ve purified it.
cool fish tank picsThis method does, to a certain extent, dilute the contaminants in the tapwater and this can work just fine for, say, soft water systems needing only a low proportion of it.
cool fish tanks uk However, it starts to make less sense if, for example, very hard water is desired, necessitating lower proportions of RO water and larger quantities of tapwater.
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A more elegant method of remineralising RO water — allowing for greater control over water chemistry — is using specific remineralising powders or liquids.
fish tank deals directThe water needs to be prepared in a separate container, never mixed in the aquarium, and, with such products, it’s possible to create the ideal conditions for aquariums, ranging from soft, acidic river systems to extremely hard, alkaline Rift Valley lake biotopes.
fish tank hood starterTFCs need TLCThe TFC membranes in RO units make up a large proportion of the overall cost of the system.
fish tank hood suppliersThey are delicate and easily damaged, so look after them.
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Regular replacement of the prefilters, plus regular flushing of the membrane, will help prolong its life.
cheap way to light a fish tankOnce an RO unit has been run for the first time never let the membrane dry out, as this will render it useless.
fish tank movers tampaSeeking even greater puritySome aquarists opt for an additional deionising (DI) stage through which the product water flows before being used in the aquarium.
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buddhist quotes on death and griefThe DI resin removes additional quantities of impurities left behind following reverse osmosis, resulting in water virtually devoid of any contaminants.
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