NLCT - ANTI FOAM defoamer Anti Foam Defoamer "Approved for wooden tubs and all Spas and Hot Tubs " Northern Lights Anti Foam Defoamer is specially formulated to work with all hot tubs and spas including use in any Wood Hot Tub. Anitfoam Defoamer is used to remove unwanted bubbles in spa and hot tub water. Northern Light"s Anti Foam is compatible with all sanitizers including bromine, chlorine and biguanide. Phosphates left over from washing bathing suites, can produce excessive bubbles in hot tub water. Antifoam chemical is a completely safe way to eliminate these unwanted bubbles. Simply squirt a small amount on to the bubbles and they will quickly disappear. These bubbles can be the source of hot tub ring (line that forms on the top surface of tub just above water line). Use Anti Foam regularly to avoid scum formed by bubbles. Will not raises the pH level in spa and hot tub water Prevents excessive bubbles Reliable, safe and effective Size: 500 ml (17 Fl Oz) We accept PayPal and Credit card (Visa or Mastercard). If you are ordering multiple units and part, please call us to see if we can save you shipping cost for multiple item orders. No taxes to US residence! Please allow 4-6 days for shipping via UPS Ground to USA or Canada. You will be emailed a tracking number to the email address you provide us. Expedited Shipping services are available! Thank you for shopping Cedar Tubs Direct Your #1 Hot Tub Parts Replacement Store!