Which filter system fits how many litres?
Manufacturers approve their filter systems up to a certain pool volume. These limits are the rows of the table — they are not chosen by us but read from the recorded figures. Where there is no limit, there is no band.
The number on the right is not a recommendation. It says how many devices the manufacturer approves up to this size — not whether one of them fits your pool. That is decided by connection and sizing, and the answer is on the page of the pool.
Why some sizes are missing
A band appears here only if a manufacturer limit bounds it and at least one recorded pool falls into it. Where there is a gap between two rows, we simply do not list a pool there yet — that is a statement about our data, not about the devices.
Could not find your pool? Go to search — that is also where you will see what fits it, which answers the question more precisely than any volume figure.