Sawyer’s 4-litre dual bag portable ultra purification system physically removes viruses from water. Use this system for one person or a group of people. The convenient bag to bag gravity system doesn’t require any pumping. Simply fill up the grey reservoir with unfiltered water, attach the filter and tube to the clean blue reservoir and gravity does the rest. Once the blue reservoir is full hang by its handle to fill water bottles, containers, and pots and pans from the dispensing cap. Bladders are 20-inches x 10-inches each. Perfect for hunting, camping, fishing, disaster relief and emergency preparedness kits or on adventure travel where potable tap and bottled water are not easily carried or safe to drink.
Compatibility: PointZEROTWO Purifier
Packed Weight: 2.5 lbs
Purifier Life: Lifetime Warranty
Recommended Use: Hiking, backpacking, ultralight backpacking, camping, emergency preparedness
Product #: [SP194]
Made in USA.
Since the filters and purifiers can continuously be backwashed and re-used they have an extremely long life. The filter/purifier membrane may never need to be replaced, however when the flow rate slows or the filter clogs, simply backwash the unit with the provided backwashing device to clear out the pores.
Be sure to slowly squeeze the water through the filter, giving the filter fibers time to fully saturate. The initial flow rate may seem slow but will increase as fibers become wetted which usually takes approximately one Litre of water.
Back Flushing Process
To maximize the effectiveness and longevity of your filter, Sawyer recommends back flushing your filter after each outing. The fibers are very robust so please be FORCEFUL in your back flush process. When using the syringe do not be gentle, it will only form paths of least resistance instead blowing out the particulates that may be trapped in your filter. When using the faucet adapter, hold the adapter on the faucet and ‘turn the water up’ to ensure particle(s) removal. Do NOT use soap when backwashing your filter.
Before storing your filter, Sawyer recommends sanitizing your filter. This process is simple: Back flush filter. Run a standard bleach solution (fragrance free) through your filter (one cap of bleach per quart of water). Let air dry and then store in a cool, dry place OR store wet and clean before using.
In case you forgot to back flush your filter after your last outing and flow seems to be little to diminished, soak the filter in hot tap water (not boiling) for about an hour and then back flush using hot tap water. REMEMBER to back flush FORCEFULLY! When using the syringe, do not be gentle, it will only form paths of least resistance instead of blowing out the particulates that may be trapped in your filter. When using the faucet adapter, hold the adapter on the faucet and ‘turn the water up’ to ensure particle(s) removal.
(If after above steps your filter still seems to be clogged) Soak the filter in hot tap water for about an hour and then back wash using hot tap water. If this doesn’t work, it could be dried calcium. Soak the filter in vinegar for 1/2 hour and then flush with hot water. You may have to repeat this a few times to get it all the way clean. Make sure you back flush with all the force you can – hold the faucet adapter on the faucet and turn the water on. The filters are tough and can take more force than you can give with the faucet adapter.
It is usually not the pouch causing the leak, it is usually the filter. Either the filter was not completely wetted at first point of use or too much pressure has been applied to pouch during filtration process. Be sure to slowly squeeze the water through the filter, giving the filter fibers time to fully saturate. The initial flow rate may seem slow, but will increase as fibers become wetted.
Back Flushing Process
Back flush your filter (better and more often) using your syringe. You cannot hurt the filter fibers, so please be FORCEFUL in your back flush process. When using the syringe, do not be gentle, it will only form paths of least resistance instead of blowing out the particulates that may be trapped in your filter.
Do not over tighten the filter on the pouch. Over tightening can cause the o-rings to embed into the threads or lodge into the opening of the pouch. If the o-ring is out of place you may not a have a tight seal and water could leak out the bottom of the filter. Please watch our video on Important Squeeze Filter Tips to better understand how to care for your squeeze bags. Until you learn the perfect balance of force and cleaning, we recommend bringing a backup pouch with you on your trip.
Before the pouches leave the factory, they are 100% air-tested. While they are rugged, these pouches are not indestructible. They tear as a result of too much pressure being applied. This happens when water is forced through the filter too fast or when your filter needs cleaning, which creates more resistance. Do not squeeze the pouch hard or wring the pouch. Torn pouches are not covered under the warranty.
Many other filters list nominal or average pore sizes which leave the possibility of harmful pathogens to pass through. By claiming absolute microns there are no variances in pore size on our filter membranes. At 0.1 and 0.02 micron absolute these are true barrier filters so there is no questionable time period whether the water is safe to drink.