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