The main components of water purifier are polyaluminum chloride, polyaluminum ferric chloride, aluminum sulfate and ferrous sulfate. It can condense impurities in water and then precipitate to the bottom of the water, thus improving water quality.

But it can't really decompose impurities, which can stimulate the epidermal mucosa of fish and lead to gill blockage after long-term use.

1. Is the fish tank water purifier harmful to fish? Fish tank water purifier is harmful to fish.

The main components of water purifier are polyaluminum chloride, polyaluminum ferric chloride, aluminum sulfate and ferrous sulfate. It can condense impurities in water and then precipitate to the bottom of the water, thus improving water quality.

But it can't really decompose impurities, which can stimulate the epidermal mucosa of fish and lead to gill blockage after long-term use.

Second, how to improve water quality 1, change water regularly: The best way to improve water quality is to change water regularly.

Normally, water should be changed once a week. If the filtration effect in the fish tank is better, the water change cycle can be postponed, and it is no problem to change it once every half month.

The amount of water changed each time should not be too large, otherwise it will destroy the original ecosystem and be harmful to the health of fish.

2. Reduce feeding: The reason why the water quality will deteriorate is because the water body is too fat, and the main source of organic matter in the water is fed fish food. Whether it is leftover bait or digested feces, it will pollute the water quality. So from the source, you need to reduce the amount of food you feed.

3. Prevention of algae bloom: If algae breaks out in fish tanks, the water quality will deteriorate rapidly.

In order to prevent water bloom, we should not only control the amount of organic matter in water, but also avoid light. Algae still need some sunlight to grow.