The engraver user used to adopt water pump to cool spindle, however, as high power spindle development, water pump isn`t able to satisfy the cooling demand. The user begins to use thermolysis type water cooler CW-3000 or refrigeration type chiller CW-5000 instead of water pump. For cooling 800W spindle engraver and 30000 r/min speed rate, we recommend thermolysis type water cooler CW-3000. CW-3000 details: http://www.teyuchiller.com/Products/ChillerCW300050Wradi.html CONTACT S&A TE:+86-20-89301885 FAX:+86-20-84309967 SKYPE: teyuchiller Email:marketing@teyu.com.cn Website: http://www.teyuchiller.com