1. Home
  2. Home & Garden
  3. Freshwater Aquariums

pH

By , About.com Guide

Definition: pH refers to the measuring unit indicating the degree of acidity of water. The degree of acidity or alkalinity is determined by the relative amounts of acids and bases in the water. If both are present in equal proportion (as in pure water), the ph is neutral or 7.

If there are more acids than bases, the water is acid (pH below 7). If bases predominate, the water is alkaline or basic (pH above 7). Aquarium waters are usually in the range of 6.0 to 8.5, depending upon the environment being replicated.
Shirlie Sharpe
Guide since 1998

Shirlie Sharpe
Freshwater Aquariums Guide

Explore Freshwater Aquariums

About.com Special Features

Holiday Central

What to eat, where to go, fun things to do and how to save money on the perfect gifts. More >

Make Your Own Scented Pine Cones

Bring a little of the fall season in your home with this easy-to-make craft. More >

  1. Home
  2. Home & Garden
  3. Freshwater Aquariums

©2009 About.com, a part of The New York Times Company.

All rights reserved.