What is PPM and TDS?

TDS- stands for total dissolved solids. This is the accumulation of minerals measured in Parts Per Million or PPM in your tap water. In NZ our typical water quality ranges from 50- 80 PPM. Below is a picture of the meter that takes the reading of the water quality and is sold with every PUREWASH system.



What is Deionized water?

Deionized water is water that has had almost all of its mineral ions removed. We can remove all these minerals that cause water spots through a process of filtration called ion exchange. Its a method that has been around for a long time most often used by laboratories to produce purified water on demand and other industries from medical through to skin care.


How does the system work?

As the water passes through our filter system, the minerals get stuck onto the pre filters and then the resin beads allowing only ultra purified water to pass through- spot free water!


How many litres of pure water does my machine make?

The answer depends on the inlet quality of your water. Using the chart below you will see that if your inlet TDS is 50, then your machine will make approximately 3200 Litres, Throughout NZ the typical TDS in your water is between 50-80 ppm in municipal areas.

Water Chart.jpg


Can i use a pressure washer with my purewash system?

Yes! A domestic water blaster draws approximately 5 litres or less of pure water through the system. This is a great idea to rinse off the soap off your car quickly or to maintain your vehicles appearance on a frequent basis without the need to scrub or chamois. Using a water blaster will get the job done quicker! A water blaster can be used for cleaning windows but is not recommended.


How much inlet water pressure is ok?

Houses running off municipal water supplies will have a regulated water pressure that is safe for the PUREWASH system. Our pre- filter is rated at 90 psi and the resin tank is rated at 150 psi. Please make sure that you dont use your system if you are going to run over 80 psi as a precaution or install a reducer valve if a high pressure pump is being used.


The system is all hooked up but no water iscoming out, why?

You may have hooked up the system in reverse. Make sure that the inlet water is going to the pre-filter of your PW5L first. Also check for STOP ends on your hose. If you have further problems, please call Purewash directly for advice.


What is Sediment Filtration?

Sediment filters are designed to remove suspended solids, which are also known as sediment, turbidity, or particulate. A sediment filter essentially functions like a net that catches unwanted dirt particles as your water flows through the system. Water can contain all sorts of sediment from rust to insects, dirt, algae and bits of washed in plant matter.

Sediment filters have a limited function. Only sediment that will become trapped in the bed of natural media is removed. Trace pathogen elements, heavy metals, and volatile organic compounds can still remain in the water.  Sediment filters are particularly beneficial when working in rural areas (well water) and are a cheaper alternative than the carbon filters for this purpose.


What are Carbon Filters?

Carbon filters remove sediment but they also remove chlorine, volatile organic compounds (VOCs), odors and unpleasant tastes from water. Carbon filters contain activated carbon, which is made through a special manufacturing process that creates more bonding sites. As water passes through a carbon filter, impurities like VOCs and heavy metals become chemically bonded to the carbon. As the water works its way through the filter, a lot of unwanted impurities will become stuck to the carbon bonding sites and the water will leave the filter much more pure than it came in.

Carbon filters are effective at removing the impurities that bond to carbon. Not all impurities do. Sodium, for example, is able to pass directly through carbon filters without being removed.