Platypus GravityWorks 4.0L Filter System

User Reviews

• Effective and reliable.
• Easy to use and simple to figure out.
• Convenient due to being able to fill quickly without a pump.
• Packs down small for easy transport.
• Filters quickly and efficiently.
• Buckle on the top of the bag makes it easy to hang.
• Buying any necessary replacement parts is simple and easy.
• Filters 4 liters of water in less than 4 minutes.

Expert Reviews

• Best water filtration option on the market for family backpacking.
• Easy to clean and takes less than 5 minutes consistently to fill.
• 8 liters of water in total capacity which is ideal for groups.
• Easy to fill by dipping the bag into deep water.
• Quick-disconnect tube attachment for efficiency.
• Screw-on hose adapter for a secure seal.
• The bag’s material is durable and long-lasting.
• The entire purification system can roll up into a bundle for easy transport.
• Able to integrate with other Platypus accessories for full customization.
• Filter claims to remove 99.99% of bacteria from the water.

User Reviews

• Might be more difficult to get water out of a shallow stream due to the bigger bag and filling-up process.
• Water that is very contaminated can clog the tube.
• The tubes can sometimes get dirty from debris from very impure water.

Expert Reviews

• Very dirty water can clog the filter.
• You can’t allow the filter itself to freeze (as that damages the filter) so you need to bring it in your tent when the temps are very cold.
• Tube can get ice build up if the tube is not emptied in very cold temps.
• Does not protect against chemicals or viruses in the water.
• Expensive cartridge replacement after 1500 liters of water.
• Filter can be damaged by impacts, so you have to treat it carefully.