Marina i110 Internal Filter (100L) Pumps & Powerheads but a general guide is

but a general guide is about 1–2 meq/L (3–6 dH) or match the existing or target carbonate hardness (KH)

and organic nutrients

Fine filter pad

Dried Lima Bean

Marina i110 Internal Filter (100L) Pumps & Powerheads but a general guide isThe Marina i110 is a compact yet powerful internal filter for use with any goldfish or tropical tank up to 100 liters (25 US gallons). Complete 3 stage filtration (mechanical, chemical, biological) is provided thanks to its uniquely designed Power Cartridge (included). The outside of the power cartridge features polyester foam to trap fine particles; while the inside chambers contain carbon to remove pollutants and odors; and zeolite to eliminate