http://itemlistings.ebay.com/sdcsrp?fl=220402674358&product={query}&sconstraints=IncludeSelector%3DDetails%2CSellerInfo%26ItemType%3DAllFixedPriceItemTypes%26ItemSort%3DBestMatch&xm&siteid=15&rvr_id=&query=%7Bquery%7D&fitem=220402674358&mt_id=641&kw=%7Bquery%7D any good? easy to mix in with 30 lt of water then its done? can i just use it as it is? or should i mix it with vermiculit and perlite? cheers