Instruction: Analyze a question and its supporting document. Predicting answerability based on the information provided in the document. Output yes if the document contains relevant information to answer the question, otherwise output no.

Input:
Question: Can this device reduce pool water to under 4ppm of chlorine, making my pool a reliable source of emergency water?
Document: I had been searching for an affordable emergency filtration system. I purchased several of the LifeStraws for our family emergency bags, so when I saw the same company made a family size filtration system, I was thrilled. One system filters a tremendous amount of water - over 4700 gallons - without using harmful chemicals and without needing replacement filters. You MUST read the directions and follow them carefully - if you do, it's not that difficult and it works just as it's supposed to as far as I can tell (I tried it out with pool water).
This is not the same as having water stored, but it is a huge peace of mind. It can basically filter one year's supply of safe drinking water from basically any source. You should also store water, but this gives you essentially unlimited potable water as long as you have some source of water to filter.
Extremely happy with this purchase. Well packaged and with a price that is remarkable. We also purchased the personal straws. The price for this item and its purification qualities make it a must have in this environment and feeling of security as our water source is not dependable. Especially living in a flood and hurricane area I dont know why everyone would not have one of these to be prepared. It gives me peace of mind-priceless.
At first I thought it would be a pain to keep clean and store it. Then as I was setting it up, I realized I was using a 5-gallon bucket to scoop water into the filter. I decided to drain the filter and let it dry for a little while then I just put it in my "source" bucket that I would probably be getting water with from the river in the event I actually needed to use the filter.I used a Reliance brand "Aqua-Tainer" to collect my clean water--Reliance Products Aqua-Tainer 7 Gallon Rigid Water Container.
This filter measure 0.02 micron,HEP A 0.027HEP B 0.042POLIO 0.03Do the math!Source:  Sick and tired? : Reclaim your inner terrain by Robert O Young. Page 249If you know any virus smaller than 0.02 micron, please post it up with references
I hope I never have to use it since using it will mean we have had some kind of a water emergency. No way to evaluate it except the peace of mind it provides.
I added the Lifestraw Family filter to my must haves for emergency situations. Water filtration will be key to survival when the SHTF. Thx for the promotion discount - this seller is a 5 star vendor...LifeStraw Family 1.0
This arrived, exactly as described, In good condition, packaged well. And the delivery was actually ahead of schedule. No problems here. I would recommend it to anyone looking for family water supply in an emergency. We live in a hurricane zone so I felt this was a must.
I purchased this to augment water supplies/purification in my emergency kit. for size and weight it seems ideal for my purposes and the gravity fed vs. direct suction on the individual life straws appeals to me. If it can actually make drinkable as many gallons of water as it says then it should be great for anyone. Shipping was fast and communication with the seller was responsive.
It works by gravity so will be useful in any situation. It's a bit on the large size so isn't ideal for emergency packs which is why I have the LifeStraws as well. This filter is supposed to filter enough water for a family of 4 to survive on for 3 years. I have a family twice that size, so will definitely be purchasing another of these filters! This is hands-down the best emergency water filtration unit out there for the price!
Answer: yes