A Bethlehem startup that designs and manufactures reef aquarium equipment is expanding.

EcoTech Marine has signed a lease with Michael Adams of NAI Summit to lease 36,465 square feet of warehouse space at 999 Postal Road in Hanover Township.

Patrick Clasen, one of the principals of the firm, said EcoTech intends to use the building for distribution and assembly. The new site is a dramatic expansion in space for the firm, which is currently operating out of a 4,000-square-foot facility on the South Side of Bethlehem.

The firm, which began selling Bluetooth-enabled pumps for reef aquariums, now sells a number of other products including reef lighting and pedicure pumps.

“We've doubled in size in just the last nine, 10 months,” said Clasen, who noted that EcoTech has grown from 23 employees at the end of 2011 to 43 employees at present.

Clasen said he hopes to have a certificate of occupancy shortly, with remodeling beginning this week.

He expects to begin moving operations to the new facility by September.

The firm intends to keep its current offices on Lynn Avenue in Bethlehem for at least the next six months, although most of the business will be run out of the new Postal Road location.

“We do want to keep at least some form of South Side Bethlehem presence,” said Clasen.