Check the listing for details. Natural Chemistry Spa Metal Free 1L. Condition: New. Listed at 26.99 USD. Spa Metalfree​ is a highly effective metal chelating agent that protects against staining and discoloration from trace metals such as iron and copper. Spa Metalfree​ should be used as part of a well-designed spa maintenance program. Spa Metalfree​ does not raise phosphate levels in spa water like many other stain and scale products. Directions: This product is designed for use in properly balanced spa water. Initial Dose: Add 1 capful (4oz) per 400 gallons directly to spa water evenly around the edge immediately after the initial fill and after each drain and refill. Weekly Maintenance Dose: Add 1oz per 400 gallons (one-quarter of the large-cap) weekly directly to spa water evenly around the edge. SHIPPING: We will do our best to ship your order based on the shipping method selected, however in some cases, your shipping method may need to be modified to meet shipping requirements based on the carrier. Our current carriers used are UPS, FedEx and USPS. Please contact us directly through the "Contact Seller" link if you need UPS, FedEx or USPS specifically for your order.Spa Metalfree​ is a highly effective metal chelating agent that protects against staining and discoloration from trace metals such as iron and copper. Spa Metalfree​ should be used as part of a well-designed spa maintenance program. Spa Metalfree​ does not raise phosphate levels in spa water like many other stain and scale products. Directions: This product is designed for use in properly balanced spa water. Initial Dose: Add 1 capful (4oz) per 400 gallons directly to spa water evenly around the edge immediately after the initial fill and after each drain and refill. Weekly Maintenance Dose: Add 1oz per 400 gallons (one-quarter of the large-cap) weekly directly to spa water evenly around the edge. SHIPPING: We will do our best to ship your order based on the shipping method selected, however in some cases, your shipping method may need to be modified to meet shipping requirements based on the carrier. Our current carriers used are UPS, FedEx and USPS. Please contact us directly through the "Contact Seller" link if you need UPS, FedEx or USPS specifically for your order.