After my problems at the weekend starting up my tank and flooding the room when the main tank managed to overflow due to the pumps being too powerfull for the drains. I feel i should add some insurance to stop this happening again. I know i can solve the problem of the pumps by adding T pieces so excess flow goes to the sump BUT this will not deal with the problem should the Durso stand pipes ever become blocked as my sump volume is so big that by the rime the sump water level has dropped to the level of the return pumps the main tank would almost definitely flood assuming that both Dorsos ever blocked. Is there any type of float valve you guys use that would cut the power to the sump pumps if the water level in the sump drop too low. I already have a drain in the sump that goes straight to waste but for noise reasons so can not use this as an insurance factor.