How to measure your hot tub filter
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How to measure your filter...
Please Note: Filter Cartridge Measurements may vary.
Always allow a variance of: (± 1/16 inches or ± 1.6 mm)
- Measure the length of the cartridge. (B)
- Measure the outside diameter of the cartridge. (A)
- Do not include any handles, strings, threads etc.
- A more accurate measurement is made by measuring through the center of the cartridge when possible.
- If the top and/or bottom is open, measure the inside diameter of the opening. (C)
- Match the cartridge end cap configuration to a corresponding one in the filter search.
- Make note of the manufacturer (OEM) and model number of the filter the replacement cartridge will be installed in.
- Take note whether or not there is a centre core in centre.
- You may also count the number of pleats (± 2) to work out sq. ft. which is explained below.
How to calculate square footage
- Count the number of pleats and measure the pleat depth in inches.
- Measure the length of the cartridge in inches excluding the end caps.
Calculation:
Pleat Counts X 2 X Pleat Depth X Pleat Length ÷ 144 = square footage
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