Pond Boss Forums Thread Like Summary - Frustrated

I have algae mats around my shoreline and filamentous algae submersed. I have raked the mats out but it comes right back. I have used Airmax KnockDown along with the Booster Plus. Several applications - some parts of the mats get brown but is not killing it. I also tried Cutrine Plus liquid with no luck. Also used Cutrine Plus granular for the submersed alge with little effect.

Other options? Should I hire someone to come in and spray it all. I have 10 grass carp that are mature and large but they do not seem to be helping anything.

Following good rains there is a small spring that flows through some other ponds above me and into my pond and then flows out of my pond. I thought about using some dye but with the outflow not sure it would help Thanks

For serious FA, 100lbs per acre is not out of the question. Depending on just how far south you are, in cold weather (winter) they may become sluggish enough they are easy targets for LMB-if present-and can be somewhat controlled in that manner.
Mozambique would be my choice if in a borderline area of survival for Blue tilapia because the Mozambique die at a higher temp.
Back to FA.. I have a customer that has a ground fed pond that has super high nutrient levels, first step is working to remove all growth-floating mats-manually. With an excess of these nutrients you are going to need to apply several methods for control. Killing it with chemical never really gets rid of it, just starts the cycle over-quicker. Killing it, waiting a week to 10 days, then applying Alum sulphate will lock up most of the dissolved nutrients and keep it from being useable to fire again, but a constant inflow of nutrients creates it's own set of issues, and proper experience applying Alum is mandatory for safety reasons with know-how on what and how much of what to use as a buffer.
It's going to be a very active management plan to implement but is probably going to be needed to get-and stay-on top of it.

Here in Indiana to use Tilapia successfully we have to do two things. 1) kill any FA within a few days of stocking the tilapia, either pre or post stocking. 2) We have to stock 40# per surface acre or it's like we never put them in.

If we don't stock roughly 50% female, 50% male the FA control isn't as good.

We typically stock 5"-9" fish.

In regards to you applying the algaecide, how much are you applying, how are you mixing it and how big of an area are you applying it on?

Plus, what time of the day are you spraying the FA?