<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px"><div id="yui_3_16_0_ym19_1_1487183234485_4559">Sean,</div><div id="yui_3_16_0_ym19_1_1487183234485_4559">You were correct, I pre heated the sub to 20C and the performance improved, after 10 minutes or so the scrubber performance really improved. When I travel to my dive site, I will turn on the scrubber while the sub is hot inside and it can get warmed up before I dive. I put a PWM controller on the fan but it performs best at full speed.</div><div id="yui_3_16_0_ym19_1_1487183234485_4559">The new Radial scrubber alone keeps up just fine (1700 PPM ) with the sensor at the front of the sub and the circulation fan running about 1\4 throttle.</div><div id="yui_3_16_0_ym19_1_1487183234485_4559">I will likely need both scrubbers going with a passenger.</div><div id="yui_3_16_0_ym19_1_1487183234485_4559">Hank</div></div></body></html>