Frequently Asked Questions (FAQs)


How does it work?
What's the difference between a filter and a purifier?
How long does the purifier or filter last?
How do I know when the purifier/filter needs changing?
Is it safe to use right to the end?
Where can I get replacement filters
Can I remove the cap and drink the water?
I have an older bottle - is this still safe to use?
Can I use the filter below freezing level?
What does it remove?
Does the water need pre-treating?
How long does it last when not in use?
How do I store it after use?
What is Turbidity?
I am pregnant - is this product safe to use?
I have hypothyroidism/thyroid problems - is this product safe to use?
Can I use this product to make baby milk?
Will the APT filter sea water/saline/fruit juice/hot drinks/urine, etc?
How do I clean the APT?

Pure Hydration and ICE° Bottle products utilise variants of our innovative M.A.D.® (Mechanically Advanced Disinfection) purifier technology platform. Additional information on M.A.D.® can be found here.

A filter will safely reduce levels of contaminant bacteria and parasitic protozoa in drinking water, while a purifier will also reduce waterborne viruses. Both purifiers and filters may remove chemical contaminants although this is less common with filters. Pure Hydration products are all technically purifiers in that they remove bacteria parasitic protozoa, and viruses. However, the miniaturised ICE° Cap is only recomended for use with treated municipal water, whereas such as the aquapure traveller can be used with any non-salt water contaminated drinking source.

The APT will typically work for up to 350L per purifier (depending on turbidity and general water quality), while the miniaturised ICE° Cap is designed for use with treated municipal water and to last for 120L of water

The APT and other Pure Hydration bottle-based systems will gradually get harder to squeeze as the purifier absorbs more particulate and other contaminants. Eventually it will stop completely in which case the purifier/filter will need to be replaced. Similarly, our InLine Purifiers and ICE° Cap will also gradually become more difficult to suck water through.

M.A.D.® products are designed to fail to safe. As long as water is able to pass through them it's good to drink.

Replacement M.A.D.® purifiers and filters can be obtained from this website ( or by calling us on +44 (0)333 600 7000 -local rate. We are happy to ship worldwide.

Drinking untreated water before it has gone through the purifer is not recommended. The filter purification process is required to remove harmful microbiological pathogens, chemicals, and heavy metals.

A M.A.D.® purifier will continue to work until it is physically blocked. It is recommended to replace a purifier 2 years after its first use, or if unused for 3 years from the date of purchase.

Once water has passed into the M.A.D.® purifier it should not be allowed to freeze, as this could damage the internal media If the purifier is known or suspected to have been frozen after first use, it should be replaced.

A M.A.D.® purifier removes a broad spectrum of potential contaminates from the water. The purifier will deal with viruses, bacteria, parasitic protozoa, chemicals, heavy metals, sediment and other contaminates.

No, but if the water is particularly turbid, we recommend using a pre-filter to try and keep the purifier from becoming prematurely blocked. A fine-weave mesh material such as muslin, a coffee filter, or, in emergency, even a T-shirt or similar material could be used for this.

You can buy a replacement Pure Hydration bottle purification cap or InLine purifier on its own, or a new purifier and bottle complete. The ICE° Cap and replacement purifiers are sold separately to the standard ICE° Bottle.

Follow these simple steps between long periods of inactivity:

  • Fill the bottle with chlorinated (tap) water and squeeze or pour through the purifier.
  • Rinse with clean water, then empty the bottle
  • Replace the purifier cap. For the APT push the pop-top down.
  • Store the bottle in a cool place until next use, it is recommended to replace the purifier 2 years after it is first used

Turbid water is water that is filled with large amounts of tiny particles. Turbid water is generally cloudy in appearance and causes filters block prematurely.

The particles are small enough to suspend in the water and settle very slowly or not at all.

Whereas the filters will remove the particles from the water, the sheer volume of them can cause the filter to block prematurely.

Good practice is to avoid cloudy water, take water from faster flowing parts of rivers and streams and from the surface rather than the bottom.

If you are likely to encounter turbid waters on a daily basis then it is a good idea to take a Milbank bag or other suitable pre-filter to remove as much turbidity as possible before using your Pure Hydration product.

Yes. M.A.D.® purifiers contains no harmful chemicals or additives so the purification of water is not a problem. However, we do recommend seeking medical advice before embarking on any foreign trips during pregnancy.

It is recommended that you seek medical advice before using this product.

Yes. M.A.D.® purifiers contain no harmful chemicals or additives, so this is safe to use. However we do recommend seeking medical advice before embarking on any foreign trips if you have hypothyroidism/thyroid problems.

Baby milk should not be made with filtered water. However if in doubt, please seek medical advice before using this product.

M.A.D.® purifier products are designed to work with fresh water sources only. Putting anything else through the filter such as sea water, fruit juice, sugary drinks, tea & coffee, urine etc will damage the filter.

It is still recommended that you clean your bottle whenever possible with warm soapy water & rinse thoroughly with chlorinated tap water. M.A.D.® purifier products should be simply rinsed through with chlorinated tap water only.

If you have other questions that aren't answered here in our FAQs, please feel free to contact us!