Question:
What is the optimum time to replace a standard Brita water filter?

I used to replace my filter every 2 months as suggested on the box. Currently, I'm using the same filter since middle of March '07, so I'm running about 5 months now. Now that I've noticed it, the box actually says "2 months OR 40 gallons" for best results. 2 months is definately long due, but i've been keeping a tally, and I've consumed about 85% of the 40 gallons (I get ALOT of water where I work since there's a water cooler/filter there, and unlike the box which assumes a family of 4 as typical use, I'm single).

Assuming the stated capacity of the filter hasn't been reached yet, should the 2 months be aboslute, or would you say there's some leeway there? If the latter, how often do you think it's best to replace the filter to keep possible bacteria and gunk that may build up due to long times of filter use out, while not wasting any extra $$ throwing away filters that could've had "a few more miles"?

Answer: Usually manufacturers will set a date or litres used for changing over filters (whichever comes first). I would think there is some leeway with timing, but it's always best to check with the manufacturer as a precaution.

Regarding bacteria, Brita say that the use of silver and the activated carbon used in their cartridges prevents growth of bacteria, and as long as the water in the jug stays in contact with the cartridge, it remains hygienically safe (see http://www.brita.com.au/help/frequently_... ).

I have used the Brita filters before and found they are OK for getting rid of chlorine and improving taste in water. However, I've recently started using the Waterman, which is a bit more expensive up front, but the filters last for up to 6 months. It filters to 0.1 micron and also re-mineralises the water, which is an effective way to increase the amount of essential nutrients in your diet. See http://www.topbuys.com.au/waterman-porta... for more info.

http://www.topbuys.com.au/waterman-porta...http://www.brita.com.au/help/frequently_...