LATERAL LACRON 120MM OPEN 1927

The Lacron 120 MM Open 1927 lateral is a filter-internal component used in sand-type pool (or spa) filters from Lacron (or compatible manufacturers). As a “lateral,” it sits at the bottom of the filter tank and serves to collect filtered water after it passes through the sand media — its slotted or perforated tube-arms allow water to flow through while holding back the sand. The “120 mm” refers to the diameter or dimension spec of the lateral, which ensures compatibility with certain filter tank sizes. In operation, these laterals ensure even water collection across the sand bed and prevent sand from entering the return stream; during backwash, they help redistribute flow to properly clean or “flush” the sand bed. If the lateral is damaged or incorrect size, sand can bypass the media and contaminate pool water — making this piece critical for proper filtration and clean water output.