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Hi, I have an inground spa which we use as a pool and do not heat. I have had trouble calculating the size mostly because of the wrap-around bench, which in turn makes adding the correct amount of chemicals tricky. I have attached a photo. Outside dimensions are 122” x 76”. Depth to middle is...

Hi, I have an in ground spa which we don’t heat and use as a pool. I estimate it is around 1700 gallons (this was sort of tricky to calculate with the wrap around bench and stairs). Lately, I have noticed the need to add chlorine more often after starting to use stabilized powdered chlorine...