Martin Pleasance Tissue Salts Silica Cleansr Condit 30ml Spray. Silica is present in the blood, skin, hair and nails. It is also a constituent of connective tissue, bones, nerve sheath and mucous membranes. Its action is deep and long lasting. Silica acts more upon the organic substances of the body, involving particularly the bones, joints, glands and skin. Silica is a cleansing, elimination tissue salt. It is a constituent of connective tissue and is present in hair, nails and skin. It removes putrid material from the body.