Measure from one side to the other side of the top of the filter as shown in the image. Your filter may have an opening on one or both ends. Measure the diameter of the hole between the 2 widest points. Types of Openings. There are three different types of openings available and only one will work with your spa, so it's very important to find.. The volume of water that goes through the filter in your hot tub is called a filtration cycle. Although every hot tub is unique, you might have some control over this, and this is typically a good way to measure the quality of your hot tub. The filtration system will produce cleaner water the more you can pump through it.

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