Cloudy water is usually a result of high/low pH, or a build up of bacteria.
1. Check your filters are clean and do not need replacing.
2. Check your pH/Alkalinity levels and adjust as necessary.
3. Give your spa pool a small shock dose ('Spa Chlor' or '02Shock' or 'Quick Fix')
4. Add ‘Crystal Clear’ or a similar clarifier and run the pumps to mix up the water.
If above steps fail – drain at least ½ of the water and replace with fresh water. Re-balance water with Startup Kit.