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Apollo Spa Filters
These Filters Meet or Exceed Specifications Set Forth By This Spa Manufacturer.
 
Square Feet
Outer Diameter
Length
25
4 5/8"
11 7/8"
Shopping Options
Top
Bottom
2 1/16" Inner Dia
2 1/16" Inner Dia
Same as:
Unicel - C-4325
Filbur - FC1220
Spa Filter
Spa Filter
Item# PA225

Square Feet
Outer Diameter
Length
17.5
4 15/16"
4 5/8"
Shopping Options
Top
Bottom
2 1/8" Inner Dia
2 1/8" Inner Dia
Same as:
Unicel - C-4401
Filbur - FC2386
Spa Filter
Spa Filter
Item#PRB17.5SF PR    Model # 817-3510
Spas w/ Standard Filter - Pull Stick on 2nd Filter    Set of 2

Square Feet
Outer Diameter
Length
25
4 15/16"
13 5/16"
Shopping Options
Top
Bottom
2 1/8" Inner Dia
2 1/8" Inner Dia
Same as:
Unicel - C-4326
Filbur - FC2325
Spa Filter
Spa Filter
Item# PRB25-IN
In-Line Filter

Square Feet
Outer Diameter
Length
50
4 15/16"
13 5/16"
Shopping Options
Top
Bottom
2 1/8" Inner Dia
2 1/8" Inner Dia
Same as:
Unicel - C-4950
Filbur - FC2390
Spa Filter
Spa Filter
Item# PRB50-IN

Square Feet
Outer Diameter
Length
25
5 11/16"
10 3/8"
Shopping Options
Top
Bottom
Closed
2 1/8" Inner Dia
Same as:
Unicel - C-5601
Filbur - FC1330
Spa Filter
Spa Filter
Item# PJW23
Front Load Filter

Square Feet
Outer Diameter
Length
50
6"
8 1/4"
Shopping Options
Top
Bottom
Posi Grip
1 1/2" SAE
Same as:
Unicel - 6CH-940
Filbur - FC0359
Spa Filter
Spa Filter
Item# PWW50 P3L
Top Load Filter    1 1/2" Lock-In SAE Adptr (Wide Thrd)
Requires 2 filters Side by Side
Note: Handle Style Will Vary

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