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Power House
It is impossible to stabilize the pH level with just one type of material.
That is where Power House concept comes in.
The pH of aquarium water changes due to various factors, but some representative factors are:
1) When an aquarium is newly set up, CO2 is discharged, raising the pH level.
2) Generally in a waterweed aquarium, waterweed photosynthesizes during the day, taking in CO2, resulting in a rise in the pH level
3) With aquariums housing many fish or large fish such as arowana, a large amount of food is placed in the water, and microbial (nitrifying bacteria) activity (nitrification) increases nitrate salt, dropping the pH level.
These are some representative factors, and in any of these cases, the water condition becomes unstable.
To deal with either a rise or drop in the pH level, Power House offers two types of products: Hard Type products―controls pH drop (slightly-alkaline); and Soft Type products―controls pH rise (slightly-acid). These types, used alone or together, can stabilize the water's pH level, enabling efficient biofiltration over long periods.

Power House Hard Type―controls pH drop
Marine aquarium for colonial cup coral or other aquatic organisms is slightly alkaline, making the use of Hard Type products suitable. Discus aquariums are a representative example of tanks in which a pH level drop is likely to occur.

Power House Soft Type―controls pH rise
Waterweed aquariums are a representative example of tanks in which a pH level rise is likely to occur. Apisto and waterweed favor slightly acidic water, making the use of Soft Type products suitable.

Hard Type's pH drop-controlling principle
Soft Type's pH rise-controlling principle
Power House Hard Type product is mainly composed of calcium silicate crystalline wollastonite. When water begins to oxidize, the product releases calcium ions, controlling the drop in pH level. Different from calcium carbonate (such as coral sand), which constantly emits calcium, the product releases calcium ions when necessary and controls the drop in pH level, making it safe not only for saltwater fish and African cichlids, but also for aquariums for discus and arowana, which tend to drop in pH level.     Power House Soft Type product is mainly composed of kaolinite activated silica. When water's pH level rises, hydroxy ions in the water increase. The nature of activated silica is such that it takes in the hydroxy ions and at the same time separates and releases hydrogen ions, preventing a rise in the pH level. This does not involve the emission of acidic substances, thus making the product safe for use with all types of living organisms.
Crystal structure of calcium silicate crystals (wollastonite)     Crystal structure of kaolinite activated silica/activated alumina
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