Size Name: Standard: 1 x Twin Pack (2 Filters) | nnPattern Name: Filter Cartridge + Dip Test Strips Lay-Z-Spa Hot Tub Filter Cartridge VI for All Lay-Z-Spa Models – 1 x Twin Pack (2 Filters) The Bestway Filter Cartridge VI is an essential feature of a Lay-Z-Spa pump as they filter out dirt and grime from the water in the hot tub to help keep it clean and healthy. They also prevent dirt from getting into the pump and heater which could cause damage. Able to be used for multiple spa sessions (dependent on usage), simply remove from the spa and wash the filter with warm water for continued long-term use. Clearwater CH0012 25 Dip Test Strips for Swimming Pool and Spa Treatment, Measures PH, Alkaline and Chlorine Bestway Clearwater 25 x Dip Test Strips are the ideal tools for quickly and easily assessing your pool’s chemical levels. Maintaining a good balance of chemicals is important for keeping your pool hygienic and looking ideal. Using the Dip Strips couldn’t be easier. Just dip one in the pool or spa, quickly remove it and hold horizontally. Check the results against the handy diagram on the bottle. The Bestway Clearwater Dip Strips are also capable of indicating the waters pH and Total Alkalinity levels making them a one stop shop for monitoring your pool chemicals. Chlorine levels inside an above ground pool should be 1 – 3 ppm (3 – 5 ppm for spas), pH levels should be 7.2 – 7.6 and total alkalinity levels should measure 80 – 100 ppm or 100 – 120 ppm, depending on the chemical solutions used to treat a pool.