15l biofilter (pressurised) typically 60 to 100l/min flow rate and good for smaller ponds up to a maximum of 7,000l stocked at hobbyist levels of fish. Bio filters pond capacity is indicative only – if unsure always buy the next biggest version. You can never ‘over do’ biological filtration, and you never want to ‘under do’ it either. Includes around 200 bio balls.
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