Need help understanding chlorine levels for SLAM.

One set was the one I used last year. That one is gone now and using the ones I just got a couple of weeks ago. They are stored inside.
And you’re measuring the spa water not the pool water, correct? I’m gonna guess the spa is smaller than 2500 gallons.
 
And you’re measuring the spa water not the pool water, correct? I’m gonna guess the spa is smaller than 2500 gallons.
No, the spa is 2500 gallons, the pool is around 33,000 (both numbers provided by the pool builder, but I haven't verified them).
 
No, the spa is 2500 gallons, the pool is around 33,000 (both numbers provided by the pool builder, but I haven't verified them).
Spas typically average about 3 feet deep. So it would need to be 8 feet wide and 14 feet long to get to 2500 gallons.
 
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Assuming those are 6" tiles, the spa is approximately 7ft x 9ft. Approximating the depths and seat size, I get a volume of 1100-1200 gallons.
When I get home tonight, I'll do some measuring! It's pretty big, but I don't remember the dimensions.