Instruction: Evaluate the answerability of a question by analyzing the related document, outputting yes if the document contains information addressing the question, and no otherwise.

Input:
Question: does it remove fluoride?
Document: I drink almost a gallon of water daily and have been using a faucet filter for years. Being concerned about what my faucet filter cannot remove from my drinking water, and because of my increased use of filtered water for cooking (and after the recommendation of a health conscious friend)  I purchased the Big Berkey and a couple of fluoride filters. After only 2 weeks I have fallen in love with my Big Berkey. Water tastes great and even my teenager is drinking a lot of water now.
All the fluoride gravity filters I've seen are the same design. I used good quality ceramic candles for years and didn't find them difficult to handle, but these black filters are harder to maintain and the piggyback fluoride filter is more than I can manage alone.
I checked to see and one of the candles is totally free of the base. Water simply pours through instead of going through the candle.I also have a problem with the fluoride filter, because it is so difficult to clean the system with it on. You have to carefully lift the top canister out so that you don't accidentally knock the fluoride filter and possibly break the connecting part.
There is immediate taste difference noticed vs. our tap water, which is chlorinated. Also, we found that when making ice, fewer resides formed in the cubes. These filters remove even food coloring. All in all, it is a good system, though it does seem very expensive to me considering you are paying about $150-200 for two polished stainless steel buckets.
Unit assembled easily. All you do is screw in two cartridges and stack it together. If you get the white fluoride filters to add on, they are a little clunky. I no longer buy gallons of water every week, our family takes this unit camping, and if were out of power and clean water after a hurricane or storm, we aren't out of clean water! Lake water tastes fantastic and so does my tap water here in the city, not to mention morning coffee.
This may be a great water filter, but it is technically incorrect and highly misleading to call it a water "distiller", as some are doing! Water distillers boil water and collect and condense the rising steam back into pure water, leaving all the impurities behind in the boiling chamber. Distillers are capable of converting any water, even sea water into pure water, and they'll even remove radioactivity from water.
This 2.5 gallon size is perfect for the two of us - we drink about a gallon daily, use 12 cups for coffee daily, use it to fill ice trays and use it for all cooking. I fill it on average almost every day. According to the filter instructions the four filters (the two that come with it + the two extra I purchased to filter out fluoride) will last me a year. It is taller than I expected but is very handsome sitting on my counter.
I tried the food coloring test, and colored water got through showing contamination. To make matters worse, the fluoride filters in the bottom got soaked with the colored water. I took the whole thing apart again, but even with lots of flushing, colored water still runs out of those filters. It looks like my only option would be to order more filters at a huge cost. It's a mess, and this system is 10 times more expensive than other water filter systems over time.
I received a notice from my city that our water supply had high lead levels. They included instructions on how I &#34;could&#34; reduce the levels and what additional precautions I could take!? !I researched EVERY possible water filtration system, cost comparison, installation, and reviews on claims for what the product would remove. I chose the Berkey RB4X2-BB Royal Stainless Steel Water Filtration System.
this is a beautiful product to bad I never got a chance to use it.
Answer: yes