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Hot Tub Things® Bottom Filter – Sundance® 75 Sq Ft Cartridge (2004–2025 Spas) – compatible with 6540-501S
Hot Tub Things® Bottom Filter – Sundance® 75 Sq Ft Cartridge (2004–2025 Spas) – compatible with 6540-501S
Hot Tub Things® Bottom Filter – Sundance® 75 Sq Ft Cartridge (2004–2025 Spas) – compatible with 6540-501S
Hot Tub Things® Bottom Filter – Sundance® 75 Sq Ft Cartridge (2004–2025 Spas) – compatible with 6540-501S
Hot Tub Things® Bottom Filter – Sundance® 75 Sq Ft Cartridge (2004–2025 Spas) – compatible with 6540-501S

Hot Tub Things® Bottom Filter – Sundance® 75 Sq Ft Cartridge (2004–2025 Spas) – compatible with 6540-501S

Hot Tub Things® Bottom Filter – Sundance® 75 Sq Ft Cartridge (2004–2025 Spas) – compatible with 6540-501S

Type: Filter

SKU: HTT-6540-501S

$40.76
$40.76 $47.95
Shipping calculated at checkout.

Available in stock

  • Premium replacement for Sundance® MicroClean® lower (outer) cartridge, compatible with OEM part 6540‑501S

  • Offers 75 sq ft filtration area using spunbound polyester media to capture fine debris for cleaner water

  • Dimensions match OEM: 8.5″ diameter × 14″ length, closed-top SAE threaded cap, open beveled 2.5″ bottom

  • Durable, washable design—rinse monthly to maintain performance, lasts multiple seasons

  • Compatible with OEM and aftermarket upper microfilter systems (e.g., 6540‑502, 6473‑165) in dual-stage setups

  • OEM cross-references: Unicel C-8380, Filbur FC-2810, Pleatco PSD85-2002, APCC7357, 18007, 80801

  • Easy tool-free install—slide in, restore water, and enjoy spa clarity

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Hot Tub Things® Bottom Filter – Sundance® 75 Sq Ft Cartridge (2004–2025 Spas) – compatible with 6540-501S

Hot Tub Things® Bottom Filter – Sundance® 75 Sq Ft Cartridge (2004–2025 Spas) – compatible with 6540-501S

$40.76
$40.76 $47.95

Product Information

The Hot Tub Things® Outer Filter – Part #HTT‑6540‑501S is a high-quality replacement for Sundance® dual-stage MicroClean® systems in 780™, 850™, and other models (2004–2024). Its 75 sq ft pleated media removes debris while resisting wear, and it installs easily without tools. Just rinse it monthly to keep your spa water sparkling and extend filter life. Compatible with all major sanitizing systems.

Item Details

Brand : Hot Tub Things™

Dimensions: 8.43 x 14.72 x 8.39 in

Barcode: 850511004741

Weight: 3.9 lb

Alternate SKU(S): - Unicel C-8380
- Filbur FC-2810
- Pleatco PSD85-2002
- APCC7357, 18007, 80801
- Inner MicroClean® filter companion: 6540-502 (disposable)
filter cartridge specs

Length: 14"

Sq ft.:75

Outer Diameter (OD):

Top:

Bottom:

Media:

Pleat Count:

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Address

1872 Rollins Road, Burlingame, CA

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