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Notes -
Unfortunately, there's a plausible alternative explanation: dead leaf and grass matter will produce phosphate as a byproduct of decomposition, and it's fairly common for pool installations to have early-spring startup phosphate problems downstream of either water or piping contaminated by that decayed matter. It's a well-enough known problem that the implementing company during the repairs would do some purges as a matter of course, but depending on the size of the pump and filtration system, that may have been hard to actually do. And taking in water with moderate phosphate amounts is common: the Obama-era reworks took in Potamac water that was pretty gross about it.
On the flip side, the amount of phosphate fertilizer necessary to produce an algae bloom in a 7m gallon tank is about the size of a milk jug if dumped directly in, and maybe the size of a backpack if just dropped in the grass near the pool, so the malicious explanation is pretty plausible, too.
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