Frequently Asked Questions

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Why Filter?
The Just Water Filter Application and Installation
Facts about Tap Water
Water Filtration
Filtered vs. Bottled Water
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Why Filter?

Why do I need a water filter?

The medical profession is unanimous in recommending adults drink between 1 ½ and 2 litres of water a day. If you are going to drink that much water per day it may as well be good quality and free from sediment and chemicals.

Why do I need to change the filter cartridge?
What does the Just Water Filter remove?

The Just Water Filter system has a 1 micron granular activated coarse carbon block filter which removes suspended solids and water contaminants including:

  • Chlorine
  • Pesticides
  • Bad taste and odours
  • Sediment
  • Rust
  • Fuels
  • Dirt
  • Herbicides
  • Detergents
  • The Just Water Filter Application and Installation

    I rent my home.  What can you do for me?

    That's the beauty of the Just Water Filter system - it is easy to install and de-install so you can just take it with you when you go.

    Can I use the Just Water Filter system on tank water?

    Not without adequate disinfection before or after it.

    Can the Just Water Filter system be connected to hot water?

    Hot water will hurt the material inside the housing. You can filter your hot water but filtration needs to be installed on the cold line before entering your hot water system.

    Will the Just Water Filter system restrict or slow my water flow?

    The Just Water Filter system may restrict your water flow to 6 litres per minute if your tap allows for a greater flow rate. You can find the flow rate of your faucet either engraved on the head of the tap, or in the owner's manual.

    Can I install the Just Water Filter system by myself?

    Yes you can, if you have a stop tap under your sink, the basic tools required (drill, shifting spanner and Phillips head screwdriver), and if you have very basic plumbing skills (like being able to change a tap washer).
    We in no way condone or recommend you making changes to your plumbing.  If you would like one of our registered plumbers to come out and install a stop tap for example, click here.

    Facts about Tap Water

    What's wrong with tap water?

    Not much, when it leaves the treatment plant. The addition of chemicals in limited quantities is subject to debate, regarding health implications. However, for example there are about 20,000kms of water pipes in Auckland alone and a good deal are decades old.  This means that the water that left the treatment plant and what comes out of your tap could be two different things.

    What could be in my tap water?

    Your tap water can contain a range of contaminants from a number of sources. Some of these contaminants can have an adverse effect on the look, smell and taste of your drinking water and others can potentially have more harmful effects on your health and appliances.
    These include but are not limited to environmental contaminants, pesticides, herbicides, calcium, magnesium, copper, lead and chlorine resistant parasites.

    How do contaminants get into the water supply?

    Most contaminants leech into our groundwater from erosion of natural deposits and surface run off from the rain. Some areas naturally have a high amount of minerals such as calcium in the water.

    Some water pipes that are used to supply treated water to New Zealand households are seventy plus years old. Contaminants such as dirt, rust, slime, sand and mud can build up for a number of years and can make the water look dirty. They can be particularly prevalent when pipes are accidentally broken or accessed for repairs and maintenance.

    What do the authorities do?

    The water authority is required to treat our water supply with a range of chemicals in order to comply with the relevant regulations.
    Key things among these are:

    What is a chlorine resistant parasite?

    There are a number of hard shelled protozoa which are resistant to chlorine disinfection. Cryptosporidium and Giardia have been discovered in domestic water supplies in Australia and they can cause immediate health problems if ingested. These are commonly referred to as Cysts.

    Water Filtration

    What is a micron/micron rating (µm)?

    A micron is short for a micrometre. Filter makers rate filters in "microns". Microns are a size measurement of the pore size, so the smaller the number, the tighter the filter. A micron is one millionth of a metre, or equivalently one thousandth of a millimetre. To put that in perspective the average human hair is about 70-100 microns wide.

    What is in the filter and how does it work?

    Carbon is a substance that has a long history of being used to adsorb (rather than absorb) impurities and is perhaps the most powerful adsorbent known to man. One pound of carbon contains a surface area of roughly 125 acres and can adsorb literally thousands of different chemicals. Activated carbon is carbon which has a slight electro-positive charge added to it, making it even more attractive to chemicals and impurities. As the water passes over the positively charged carbon surface, the negative ions of the contaminants are drawn to the surface of the carbon granules.

    Carbon filtering is a method of filtering that uses a piece of activated carbon to remove contaminants and impurities, utilizing chemical adsorption. Each piece of carbon is designed to provide a large section of surface area, in order to allow contaminants the most possible exposure to the filter media.

    Carbon filters are most effective at removing chlorine, sediment, and volatile organic compounds (VOCs) from water. They are not effective at removing minerals, salts, and dissolved inorganic compounds.

    Granulated Carbon (GAC) has long been utilized to reduce impurities in potable water. It is widely recognized for its adsorption capacity plus its ability to reduce dissolved organics and chemicals such as chlorine. These and other impurities can cause undesirable taste, odour and colour in water.

    The Just Water Filter cartridge consists of finely powdered activated carbon particles that have been bonded together to form a totally uniform, solid profile with superior adsorptive capacity and kinetic efficiency. The filter and cartridge elements are designed to flow in a radial, outside to inside direction resulting in low pressure drop, high flow rate and increased dirt holding capacity.

    Manufactured entirely from FDA approved materials, the Just Water Filter is suitable for residential point-of-use water filtration as well as commercial and food service applications. The filter is manufactured from high purity activated carbon.

    Why do I need to a filter with so much capacity?

    We want you to drink more tap water so you can stop buying bottled water! Competitor products don't even filter your average consumption! We all should be drinking 8 glasses of water a day, that's 730,000L a year.

    How long do filter cartridges last?

    In domestic applications the filter cartridges should be changed every twelve months.

    Although the Just Water Filter cartridge has a high capacity, it is possible that they may last less than twelve months if you live in an area where the sediment levels in the water are particularly high. If you experience a significant reduction in the flow of your filtered cold water supply you should try changing the filter earlier.

    Filtered vs. Bottled Water

    What's the difference between bottled water and filtered water?

    Very little, in general terms the one major difference is the source. Spring water comes from out of the ground and filtered water comes from your municipal supply. Spring water then goes through sediment and carbon filtration to make it safe and palatable for bottling. With the Just Water Filter you don't need to store or lift heavy bottles and it is better for the environment than buying individual bottles of water - 65% of which end up in landfill. Plastic water bottles are becoming a major environmental hazard. They suck up valuable fuels to make and create mountains of rubbish when they are thrown away.

    Why filtered water over bottled water?

    Growing cynicism about the excessive cost of bottled water combined with increasing concern over water safety and the environmental impact caused by manufacturing and drinking bottled water have made home water filters increasingly popular.   

    A household of four that consumes an average of one hundred and fifty 600ml bottles of water a year would save the eighteen litres of oil and six hundred litres of water used for manufacturing and transporting the bottles, over 2kg of plastic and 8.4kg of carbon emissions that are produced during the manufacturing process.

    The cost of an at-home water filtration system is only $0.01 per litre of impurity-free drinking water compared to an average rate of $2.53 a litre for bottled water and home filters do not produce the environmental waste single-serve bottled water does.

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