Bleach is your first weapon. It’s like napalm for slime. Pour a specific amount down your well—check your local guide; don’t just guess.
Let it sit for 12 to 24 hours. The bacteria will freak out and die. Then flush your system until the bleach smell is gone. It’s a mini chemical war, and you win.
Warning: This can upset your septic tank’s good bacteria. So don’t do it every week. Think of it as a one-time drama, not a weekly soap opera.