Replacement course blue sponge / foam suitable for OASE filtoclear, models 12000, 16000, 20000 and 30000 models.
OASE filtoclear 12000 requires 3 x coarse blue sponges and 2 x fine red sponges
OASE filtoclear 16000 requires 4 x coarse blue sponges and 3 x fine red sponges
OASE filtoclear 20000 / 30000 requires 5 x coarse blue sponges and 4 x fine red sponges.
These are just the coarse blue sponges for the above models, please add how many you need of these and then purchase the number of red sponges you require