Response to Hi. This filter is for an inground pool and will be sufficient for a 20'x40' pool. You'll have to be sure that your pump flow rate does not exceed 120 GPM.

An image is worth 1,000 words! Add an image or two to your comment to help ensure it is understood accurately.

Yes, please email me exclusive discounts, swimming pool tips and helpful how to guides. This comment may be posted on a public site. Do not include: HTML, references to other retailers, pricing, personal information, or any profane, inflammatory language.