<html><head></head><body><div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div>River,</div><div>I was thinking that the large fan on Gamma's scrubber was increasing exposure do to increased volume. It is weird, it obviously worked well for many years and dives with two occupants. I went with the computer fan driven scrubbers instead of restoring the original scrubber because the original was very loud.</div><div>Hank</div></div></body></html>