i know the tech clean one is good, but i think one with a automatic pump out would be better so just the sand, moss, dirt is left in the drum, some of the jobs i do have bad drainage so i need to expel the water from the vac so its just the crap left so i can bin it. otherwise i would have to empty the drum somwhere and do it lots of times as there is a lot of sludge on big jobs. i have not even got a vac at the moment and today i spent an hour trying to drain the water off the sludge to scoop it up with a shovel!! what a nightmare. with the right vac i could let the water just go down the grid and sediment stay in vac. i have posted a similar thing before a while ago apologies but am after more help or ideas on the subject as im sure others have the same problem! many thanks for reading this,