Darlly 40103 10sq ft 7″ x 4″ (180mm x 100mm) PMA10

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Darlly 40103 hot tub filter that fits inside the larger outer filter.

Has a 2  1/4″ hole running all the way through sometimes referred to as a bobbin filter

compatible with Pleatco PMA10 and PMA45 filters used on some master spa models.

Compatible with and can replace.

Unicel C-3310AM

Please look at the photos ( for illustration only) and measurements closely and if you are in any doubt please call us for assistance in choosing your filter


  • Diameter: 4″ (100 mm)
  • Length: 7″ (170mm)
  • Bottom Hole: 2 1/4″ (57mm)
  • Bottom
  • Hole: 2 1/4″ (57mm)
  • Filtration size: 10 sqft


Used in some of these spas.

Master Spas