Of course, an attorney might be able to give some other options, which would make a consultation a benefit. The down side may be the cost. An attorney may not take the case without payment or if they do take it on contingency they will take about 1/3 or the recovery and can still require you to pay for any expert investigations. So there may be a cost factor to consider. If this is the case and the costs are too great for you to continue another option may be to contact your neighbor via certified mail to document their knowledge of the actions and the impact on your property. Then you contact them again to advise them of your intent to file a claim with your insurance carrier for the damages, which when coupled with the notice of their actions and impacts places them at fault. If there has been sufficient time for them to have changed the way they maintain the pool but have not done so, their insurance carrier would not defend them given the acts would be more willful than negligence at that time. This means that when your insurance carrier sues to recover damages, which will include all of their legal costs, they will target the neighbor personally. Fighting the legal might of an insurance company is very difficult when you are in the right, but in this case it would probably be a lost cause. Once the situation is set and the neighbor is aware of the possibilities you can explain the situation to them in the hopes they change. If they do not change you can follow through with the claim. I would discuss this with an attorney and your insurance agent to ensure the situation does not have any unknown wrinkles since laws vary on insurance, but it is a last ditch effort before spending your money.
With friends like Guido, you will not have enemies for long.
“Intellect is invisible to the man who has none”
"The difference between genius and stupidity is that genius has its limits."