American Spas AM-628TM, Owner'S Manual

American Spa Owner’s Manual

LTR50001143, Rev. ZZ

Clear W

ater 

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32

Ozonator

The ozone generator releases ozone into the spa water. You will still need to test for chlorine or bromine and 

occasionally replenish it to return the sanitizer level to the baseline.

For spas without a circulation pump, pump 1 will run at low speed and the ozonator will run during filtration.

For spas with a circulation pump, the ozonator will run with the circulation pump.

The spa’s control system is factory-programmed with one filter cycle that will run in the evening when energy 

rates are often lower. The time and duration of the filter cycle can be set according to your needs. In addition, 

a second filter cycle can be enabled. Filtration time may need to be increased with heavy bather load.
See instructions for setting filtration cycles on page 23.

Bather Load

Filter Cleaning

“Bather Load” is the term used to describe the number of people using a spa, combined with the length of 

usage, and the frequency of usage. All these factors have a great effect on the spa water. The higher the bather 

load, the more chemicals need to be added and a longer filtration time will be needed.  

Recommendations are designed for spas with average bather load (3 to 4 people, 15 minutes of usage, 

three times a week at 100 degrees) If your bather load exceeds these guidelines, and you experience water 

quality problems, increase the amount of filtration first, (go to the next higher filtration number) then if water 

quality is still not adequate, consult the advice of your Cal Spas dealer for additional chemical or system 

recommendations. Be sure to give them your bather load information.

The filter is the part of your spa that removes the debris from the water and needs to be cleaned on a regular 

basis to maximize your spa’s filtering performance and heating efficiency. 
In  addition  to  spraying  off  the  filter  weekly  to  remove  surface  debris,  your  filter  should  be  deep  cleaned 

periodically to dissolve scale and particles that get lodged deep within the filter fibers and impede the filtration 

process. Even if the filter looks clean, scale and particles can clog the fibers and prevent water from flowing 

through the filter resulting in the most common spa problem—no heat, caused by a dirty filter. 
We recommend you clean your filter once a month and replace it once a year or as necessary.

It is extremely important that you never run the spa without a filter. There is a possibility that 

debris may be sucked into the plumbing through the filter well.

Cleaning the filter

1. 

Remove the filter by unscrewing it and pulling it up and out.

2. 

Place the dirty filter into a bucket of water deep enough to cover the filter. Add 8 oz of liquid filter cleaner 

to the bucket of water.
Note: 

It is a good idea to keep a spare filter to use in the spa while the dirty filter is being deep cleaned. 

This way, you can rotate the filters and both will last longer.

3. 

Soak the filter for a minimum of 24 hours.

4. 

Spray the filter with a water hose. Spray each pleat carefully.

5. 

Reinstall the filter. Do not overtighten.