Because it’s convenient and cheap, you might be tempted to pour tap water into your aquarium. However, depending on whether your water comes from a municipal source or from a well in the back yard, it can have a pH too high for your prize aquarium inhabitants, as well as harbouring heavy metals, chlorine and other chemicals less than savoury. find out more
The solution to your water problems lies in owning your own unit for reverse osmosis (RO). By forcing tap water through a sequence of membranes and filters, RO units purify the water. The membrane allows water molecules to move through, but larger molecules are stopped by the membrane, such as limestone and other minerals, and contaminants. The end result is water that, depending on the type of membrane used, is up to 99 per cent pure. A cellulose tri-acetate (CTA) membrane that is manufactured from organic materials is the most fundamental membrane. Your water will be purified from 88 to 94 percent by using a CTA, but this membrane does not remove chlorine from the water. In order to let the chlorine gas dissipate, you will still have to have a dechlorinator for your aquarium, or you can set your water out for 24 hours before using it. The thin film composite (TFC) membrane is a more progressive membrane. The TFC membrane in your reverse osmosis unit is made of synthetic material and will eliminate 97.5 to 99 percent of water impurities. The high removal membrane is another membrane which consists of synthetic material. The high removal membrane purifies your water from 97.5 to 99 percent, just like the TFC membrane, with the added advantage of removing silicates as well. The RO unit also comes with a carbon block, a sediment filter, and deionization (DI) resin, along with the membrane, if it is a four-stage unit.