Replaces SW30-4021 FilmTec DOW / DuPont 800 GPD at 800 PSI 4 x 21 inch HCTI Membranes ( MEM-4021SW-HF )

Replaces SW30-4021 FilmTec DOW / DuPont 800 GPD at 800 PSI 4 x 21 inch HCTI Membranes ( MEM-4021SW-HF )

Marsoni

M251S

$220.50

Get it in 3 business days with 1 day shipping. Friday, May 29

Replaces SW30-4021 FilmTec DOW / DuPont 800 GPD at 800 PSI 4 x 21 inch HCTI Membranes ( MEM-4021SW-HF )Replaces SW30 4021 FilmTec DOW DuPont 800 GPD at 800 PSI 4 x 21 inch HCTI Membranes ( MEM 4021SW HF ) ONLY 1 LEFT IN STOCK! FREE SHIPPING TO THE CONTINENTAL UNITED STATES! Financing Options Available at Checkout via Shop Pay! 1 YEAR MANUFACTURER'S WARRANTY! MADE IN THE UNITED STATES! For Quantity Discounts Contact Us for a Quote! For International Shipments Contact Us for a Quote! PRIVATE LABELING AVAILABLE! Call: 1 (760) 598 0189 Email:

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These socks are the bomb! If you are athletic or on your feet for extended periods these great looking, well made socks are constructed to offer just the right amount of compression and support. The toe is soft and thick. I will order these again and again. Hopefully Amazon will add even more color choices on the future.

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Reviewed in the United States on December 3, 2022

Verified Purchase

Heather H Ansley

Charlottesville, US

★★★★★ 5

Goldilocks of socks!

Size: Medium, Color: Deep Sea/Breaker Blue/Electro Pink

Great socks....good support - the goldilocks. Not too thick or too thin; stay up nicely. Love the colors!

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Reviewed in the United States on January 30, 2024

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Penny

Omaha, US

★★★★★ 5

Best socks

Size: Medium, Color: Pink Elixir Assorted

Everyone got socks in their stockings this year. But no one was complaining. They weren't thin like some socks. But not super thick either. Just right. I even bought a pair for myself. No regrets. Will definitely buy again.

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Reviewed in the United States on January 24, 2024

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Debbie Flynn

Carnegie, US

★★★★★ 5

Love it it was perfect for what I needed it for. Good quality!

Size: 4 Panel, Color: Black

It like a very dark chocolate brown/black. What I liked most about it is that you just pull it out of the box take the long plastic film off of it and it's ready to go. It has protective feet on the bottom. It's very attractive and it was so easy. It's so nice when you have a product you don't have to assemble.

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Reviewed in the United States on May 13, 2026

Verified Purchase

Suphisara B.

Houston, US

★★★★★ 5

Good quality. Nice design

Size: 4 Panel, Color: Chocolate Brown

Love it. Beautiful and good material. Just a little bit too high for my room.

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Reviewed in the United States on May 7, 2026