
Hayward Pro Series 21 In Side-Mount Sand Pool Filter W3S210S
Description
The Hayward Pro Series side-mount sand filter uses a precision-engineered umbrella-fold self-cleaning lateral system for efficient flow and evenly distributed water, giving totally balanced backwashing and long-lasting performance. Molded from durable, corrosion-proof material, it delivers dependable all-weather operation, and a large pressure sand and water drain makes winterizing and servicing fast. This side-mount configuration is well suited to in-ground installations, and a 1.5 inch VariFlo control valve is included.
Features
- Umbrella-fold self-cleaning lateral system for balanced backwashing and long life
- Durable corrosion-proof materials for dependable all-weather performance
- Large pressure sand and water drain for rapid winterizing or service
- Side-mount configuration for in-ground installations
- 1.5 inch VariFlo control valve included
- Included pressure gauge
Specifications
- Part Number: W3S210S
- Type: High-rate side-mount sand pool filter
- Tank Size: 21 in
- Sand Capacity: 200 lb
- Design Flow Rate: 44 GPM residential, 44 GPM public
- Backwash Flow Rate: 44 GPM
- Maximum Working Pressure: 50 PSI
- Valve: 1.5 inch VariFlo, included
- Drain: 1.5 inch
- Application: In-ground pools
- Tank: Polymeric resin, corrosion proof
- Footprint: 20.5 in x 20.5 in
- Clearances: 18 in side, 18 in vertical
- Dimensions: 32 in H x 20.5 in x 20.5 in
- Shipping Weight: 49.4 lb
- Warranty: 1 year parts
Shipping & Returns
Shipping: We offer free standard shipping on all orders within the contiguous United States (lower 48). We do not currently ship to Alaska, Hawaii, or Puerto Rico. Any other restrictions will be shown at checkout. We do not currently ship internationally. Orders ship within 1 to 2 business days, and delivery typically takes 4 to 6 business days after shipping, for a total of about 5 to 8 business days from your order date.
Tracking information is emailed once your order ships. We do not currently offer international shipping. See our full Shipping Policy for full details.
Returns: Unused items in their original packaging may be returned within 30 days of delivery. To start a return, request a Return Merchandise Authorization (RMA) by emailing support@nationalpoolsupply.com or calling +1 978-222-0628 with your order number and the reason for the return (include photos if the item is defective, damaged, or incorrect). Once your RMA is approved, ship the item with your RMA number to: DHB Enterprises LLC / National Pool Supply, 30 Log Bridge Rd, Building 300, Unit 301, Middleton, MA 01949. Change-of-mind returns: you pay return shipping, and a 15% restocking fee applies; original shipping costs are not refunded. Defective, damaged, or incorrect items reported within 30 days of delivery are returned at no cost to you with a prepaid label, and no restocking fee applies. See our full Refund and Returns Policy for full details.
Warranty
Manufacturer Warranty:
This product carries the manufacturer's warranty, where applicable. Warranty terms, coverage, and exclusions are set by the manufacturer. Warranty claims are filed directly with the manufacturer; we do not process warranty claims or offer a separate warranty of our own. If you need the manufacturer's contact details, contact us and we will share them. See our Warranty page for details.

Pool and Spa Parts & Supplies
Why Choose National Pool Supply?
We're dedicated to offering pool and spa products from leading brands. At National Pool Supply, your pool’s care is our priority, and we’re here to make your experience effortless.




