The hinged float cover shields the valve from stock damage — set it and forget it.
Yes, the contoured Sweep Trough Broom (STB250 or STB450) is sold separately. It's shaped to match the trough base for efficient cleaning.
Fill the ballast-compatible base with water once it's in position. It's light enough to move yourself, then rock-solid once ballasted.
About 5 minutes. The curved sweep-out base lets you push debris straight out the end without draining the trough. Traditional troughs can take 30+ minutes.
The 250L (SWP250) suits smaller mobs or tighter spaces. The 450L (SWP450) handles higher-demand watering and is available with 25mm, 40mm, or 50mm float valves for faster refill.