Puretec WS Series Washable Screen CartridgeThe Puretec WS601, a washable screen cartridge, is ideal for the removal of high sediment and dirt, at a high flow rate. With a coarse filtration rating they are typically used for pump protection, aquaculture, etc. This cartridge is not recommended as a final filter for drinking water. External screen can be removed by unscrewing the end cap off the centre core cage, making this a long life filter that can be washed many times.