Main Drain – Not really a drain but rather a suction point generally connected to the skimmer. Main drains are required to split into a minimum of two suction points at least 36 inches apart. Note: Suction for water features etc. are also required to split to two points at least 36 inches apart.
Mastic – The flexible compound installed between the concrete decking and the coping of a swimming pool or spa. It is an essential element of prohibiting water from making its way under the swimming pool decking, there by causing structural problems such as rising or settling of the concrete decking.
Mechanics Lien – In most states, including California, if a subcontractor or supplier that delivers to, or supplies services to your property is not paid, he has the right to place a lien on the improved property to protect his right to be paid. This is the case even if a contractor is paid but he in turn does not pay his suppliers or subcontractors. Those suppliers and subcontractors still have lien rights. A subcontractor or supplier must file what is called a preliminary notice within 20 days of completion of his work in order to maintain his lien rights.