pH (permanent hardness) is the measure of acidic or alkaline conditions in water, where a value of 7.0 corresponds to a neutral pH, pH values about 7.0 are considered alkaline, and pH values below 7.0 are considered acidic.

Different fish need different pH levels to be healthy, so it is important to test your water regularly to ensure pH levels fall where they should.

API® pH DOWN pH adjuster is:

• Fast-acting, colourless, easy to use, and will not cloud aquarium water.
• Phosphate-free and nitrate-free, will not encourage algae growth.
• Safe for all fish and plants.
• For freshwater use only.