Ozone Method: Troubleshooting Start-Up Regular Maintenance Trouble-shooting Cloudy water 1 Treat with Defender (lowers calcium levels). 2 If the problem persists, use Spa Algaecide or Enzyme. Eye/skin irritation 1 Use Chlorine Test Strips to measure your spa water alkalinity and pH levels. 2 Adjust total alkalinity and pH as necessary using Spa Up or Spa Down. Scum lines & odors 1 Clean scum line with CitraBright surface cleaner. 2 Add 1 fl oz. of Enzyme per 250 gallons of water. Excessive foaming 1 Add Foam Down. 2 Shock with Renew non-chlorine shock oxidizer. 3 Use Chlorine Test Strips to measure your spa water calcium levels. 4 If calcium levels are below recommended 150-400ppm, use Calcium Booster to raise ppm levels.