LADDER BUMPERS: 

Rubber caps or inserts which protect the pool plaster or vinyl liner from the sharp steel ends of the ladder.

 

LATERALS: 

Elongated, capped plastic nipples at the bottom of a sand filter which are slotted to allow for water passage while keeping the sand in the filter tank.

 

LIGAND:

An atom, ion, or molecule that generally donates one or more of its electrons through a coordinate covalent bond to, or shares its electrons through a covalent bond with, one or more central atoms or ions (these ligands act as a Lewis base).

 

LOAD: 

An electric device which consumes energy, placing a load on the source.

 

LOW WATER SUCTION: 

An influent fitting, typically low on the wall in the deep end of a vinyl liner pool. A cheaper alternative to a main drain.