SeaLite Engineering, Inc., is a 29 year-old R & D company that has focused on new ways of oceanographic sensing that minimize the ocean’s natural and aggressive tendency to foul instrumentation. Long deployments of sensors and instruments and the use of autonomous underwater vehicles (AUVs) have increased the importance of protection from fouling, now often the limiting factor in deployment durations.

Figure 1. Buzzards Bay estuary fouling of instrument housing after 21 days in July.

Figure 2. Gulf Bayou sensor fouling after 21 days in July.

SeaLite has developed patented technology* for preventing the fouling shown above. It uses: 

  • (1) selective halogen electrolysis of seawater*, 
  • (2) density-driven boundary layer flow*, 
  • (3) early stage biofilm intervention*, 
  • (4) conformable, stable electrodes*.
  • (5) microshield driver electronics that provide a fixed cycle, are controllable from on- board biofilm sensors or remotely*,
  • (6) unmeasurable residue.

This technology has undergone extensive testing and at-sea deployments since 2015, first in a Buzzards Bay, Massachusetts estuary and, independently, in a University of South Florida station in a Gulf Coast Bayou. These both involved year-long deployments, and intercomparisons with other techniques of antifouling.

A prototype chlorine microshield was installed in the sensor guard of a YSI 5-sensor instrument (the EX01). This instrument was then deployed in Clam Bayou, Florida, in May 2015; the sensors are shown in figures 3, 4, and 5 after 2, 3 and 5 months. The thin, planar and formable electrodes have also been adapted to protect mooring lines and a transmissometer.

The improvements that the chlorine microshield provides over other antifouling methods are: durability over long deployments (> 1 year), low power consumption and large area protection.

Figure 3. Chlorine microshield protection, after 2 months in Clam Bayou, Florida.

Figure 4. Chlorine microshield protection, after 3 months in Clam Bayou, Florida.

Figure 5. Chlorine microshield protection, after 5 months in Clam Bayou, Florida.

SeaLite Engineering offers custom configuration of electrodes to specific applications for customers who desire fouling protection for sensors, instrument housing and AUV control surfaces.


Sealite Engineering

508 564 4404, 

19 Mystery Lane, Box 401

Cataumet, MA. 02534

*U.S. Patent No. 9,090,492 of June 19,2015

  U.S. Patent No. 9,371,243 of June 19, 2016

  Other U.S. Patents Pending.

Journal of Atmospheric and Marine Technology, 2021:

Antifouling with Chloride Ion Electrolytic Recycling through a Momentum Boundary Layer.