Cal spas circuit board CS5000. This Circuit board will replace Cal Spa circuit boards chip numbers, CS5000R1D C2100R1A, C2100R1B, C2100R1C. This board can also be used to replace C2000R2A, C2000R2B, C2000R2C. There will be a reduction in the default length of the filter cycle when replacing these boards. It will drop from 4 hours to 2 hours. This item is in the category "Home & Garden\Yard, Garden & Outdoor Living\Pools & Spas\Spas & Hot Tubs". The seller is "a-1spacontrol" and is located in this country: US. This item can be shipped to United States.