Logging Brita filter performance is an easy job. All you need is a measuring cup, a pen, pad of paper and a way to measure time in seconds. Here are the steps I followed.
First I prepared a new filter according to the instructions on the Brita® Advanced Filter carton. That involves running some tap water through the top of the filter for about fifteen seconds. Then you insert the new filter into your pitcher.
Next, I measured the time it took to filter one quart of water. I filled a one-quart measuring cup with water. I waited until the second hand on my clock was at 12, then I poured the water into the top half of the pitcher. I wrote down the starting time in minutes and seconds and then waited. When the water disappeared in the top half, I wrote down the ending time, also in minutes and seconds. I took the difference between start and end, and wrote it down as the time to filter one quart. I kept a separate piece of paper for these filter time measurements and used the pad for logging. If you have a stop-watch, the time measurement is even easier.
Logging Brita Filter Performance Is Easy
Logging is also easy. On the pad of paper I recorded the date, time and how much water I filtered. Every time I emptied the Brita, I added more water and wrote down a log entry. I found that if the pitcher is completely empty, it can hold one and a half, or 1.5, quarts. When the water level is slightly above the bottom of the filter, it usually only has room for one quart.
Here’s an example from my log for one filter.
I learned by experience that the rate of performance loss is unpredictable. The first time it took about five or six weeks and around thirty gallons. But other times, the filter clogged after only six gallons and about a week.
For this reason, I recommend measuring the filter time every two gallons at least. By that I mean when you have filtered another two gallons of water since the last measurement, it is time to take a new measurement. Just watch your log. If it helps, keep a running total in another column. For example, you could measure the filter time at zero gallons when you install a new filter, then again at 2 gallons, 4 gallons, 6 gallons and so on.
If you start to see the filter time increasing, you can also take time measurements more often, like every gallon. When the filter time gets up around an hour, I usually get tired of waiting and end the experiment. There is no point in taking more measurements to prove that the filter eventually becomes so clogged it takes over four hours to process a quart.
Sharing Your Data
For me, the whole point of logging Brita Filter performance is to get enough data to explain the problem. The two filters I tested prove nothing by themselves. I need much more data. That means more filters. The results will be even stronger if the data comes from multiple people, filters with different manufacturing codes and water from different sources.
So I have created a form you can use to share your results. When your logging and measurements are complete, visit the Brita Data Form and share your data.
Next: read why I decided to document my Brita Filter Slow Performance.
Aggregate data: Brita Filter Performance Graphs.
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