
The important thing with Diatomateous Earth is to make sure its
Food Grade...so I always buy mine from wiggly wigglers (Dosing frequencies for all animals are on the tub that it comes in)
http://www.wigglywigglers.co.uk - its under Best Sellers
It is absolutely brilliant stuff for killing worms...fleas...ticks...mites (and any creepy crawlies for that matter) and has a multitude of other uses..... Just dust lightly into coat to kill fleas and ticks and add to raw food to kill worms. Dust between toes and pads.... to remove residues. Best of all it is 100% safe...and 100% natural....so you can safely and naturally do away with monthly chemical flea treatments (which in Robbies case would be just another burden on a fragile immune system)
Although the following is quite "Americanised" there is lots of useful information about Diatomateous Earth.... and its uses... applications....dosings...frequencies etc on the following site (if this link works !)
http://wolfcreekranch1.tripod.com/defaq.html I don't know about using hibiscrub....