I have a weeping water wall feature in which water pours out of the top of the wall and drains into a 6 in. wide and deep trough that is connected to the pool. The trough catches a lot of sediment and debris and it is very difficult to keep it clean.
What kind of equipment would you recommend to keep the trough vacuumed out? I've tried the battery powered spa vacs and they are useless, not having enough suction power. The vac head would need to be fairly narrow to fit, perhaps 4 in. or so.