Home-made water filter – http://www.rcgroups.com/forums/showthread.php?t=1700535 Acrylic tube – http://www.astrumspb.ru/catalog/1/199/222.html Sheet plastic – http://www.helvetica-spb.ru/goods-4-spb.html More plastic – http://polyglass.ru/produkciya/pet/#content A bit of theory on wet vacuums – http://www.averncleaningsupplies.com/blog/2013/08/wet-and-dry-vacuum-getting-the-most-from-it/ Anti-foam – http://www.geeksonhome.com/how_12182434_homemade-antifoaming-agents-hot-tubs-spas.html
Read MoreArc length calculator – http://www.1728.org/radians.htm Chord length – http://www.mathopenref.com/chord.html Trigonometry – https://www.mathsisfun.com/algebra/trig-finding-side-right-triangle.html arc.php
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