Approved installers of Delta membrane systems Established in the remedial damp proofing industry, Aqua Apsentis has many years experience in the eradication of water ingress and are the South Wales regional recommended approved installers for Delta membrane systems. Only tried and tested, state of the art products are provided for the company's well established client base. Guaranteeing confidence in the product and installation process, insures that Aqua Apsentis continue to be the market leader in South Wales.