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Re: water filter
Roger writes:
> The pH difference isn't very significant because it changes with the CO2
> content; it's really only the 1 degree change in alkalinity that makes any
> difference to the use of this water in an aquarium, and that 1 degree
> doesn't (to me) justify the expense of using the filter for water
treatment.
> Maybe with a newer filter the change would be bigger.
>
When I used a Brita to fill and maintain my tanks a couple years ago, I was
careful to use the filter for no more than 32 gallons, as recommended on the
package. I was not checking KH in those days, but GH went from 12 degrees to
4 degrees. I only got a drop in pH from 7.8 to 7.4. Further pH reductions
remained difficult to obtain, so I suspect KH remained at or near tap water
levels. For my South American fish, the change in general hardness was
welcome.
Bob Dixon