Scum Balls – 2 pack View cart “Bio Ouster Portable Hot Tub Watercare Kit” has been added to your cart. $14.99 Add to cart Add to Wishlist Category: Spa Chemicals Related products Bio Ouster Restoration Plumbing Cleanse $49.95 Add to cart FROG @Ease Floating System (for Spas) $56.99 Add to cart Jet Clean 16oz. $14.99 Add to cart Spa Up / pH Up 2 lbs $14.99 Add to cart