The verdict: the Beatbot iSkim for leaf volume, the Aiper EcoSurfer S2 for chemistry distribution. For most pools under trees, volume wins.
Head to head
| Beatbot iSkim | Aiper EcoSurfer S2 |
|---|
| Basket volume | 9 L | 4 L |
| Power | Solar, 24/7 | Solar with dual charging, 35 h battery |
| Navigation | Dual-ultrasonic avoidance, anti-stranding | Edge cleaning |
| Retrieval | App recall, auto return | App control |
| Chemistry | None | Adjustable chlorine dispenser |
| Water type | Saltwater-safe | Not stated |
Why basket volume dominates
A skimmer with a full basket is a floating ornament. Everything else about it — solar charging, app control, navigation — only matters while there is room in the basket. So the real specification is how many hours of leaf fall it absorbs before you have to walk out and empty it.
9 liters against 4 is not a marginal difference. Under a mature oak in October, the EcoSurfer needs emptying twice a day and the iSkim once. Over a six-week fall season that is roughly forty trips to the pool you do not make.
Why the EcoSurfer’s dispenser is still interesting
A chlorine dispenser on a moving platform distributes sanitizer around the pool as it travels, rather than dissolving it in one corner or in the skimmer basket. That is genuinely better chemistry distribution than a floating dispenser that parks itself downwind, and it means one fewer object in your pool.
It also publishes a 35-hour battery and supports mains top-up, which matters if your pool is shaded — and shade is usually why you need a skimmer in the first place. Keep an eye on your readings when you first use it; a dispenser that moves distributes differently from one that does not, and the CDC’s target ranges are what you are aiming at either way.
Anti-stranding versus edge cleaning
These address the same failure — wind pushing a skimmer into a corner where it sits all afternoon — from different directions. Beatbot’s dual-ultrasonic avoidance plus anti-stranding is the more comprehensive approach on paper, and app recall means you rescue it from your phone rather than with a pole. Aiper’s edge cleaning treats the edge as somewhere to work rather than somewhere to escape, which is arguably the better idea since the edge is where debris collects.
Neither eliminates the problem. Both reduce it.
The budget option, and the one-machine option
The Betta SE at around $370 has several seasons of owner feedback behind it, is salt-rated, works in above-ground pools, and uses a remote rather than an app. It does not publish a basket volume, which is a real gap on the one spec that matters — but it is the proven choice.
If two machines is the objection, the Beatbot Sora 70 skims and cleans the floor in one unit. It costs more than a skimmer plus a decent floor robot and splits its runtime between both jobs — compared against a corded Dolphin here.
