Nutgrass!! Weeds in pool!

Nutgrass Will Not Destroy Your Above Ground Pool Liner
Nutsedge or nutgrass is a persistent weed. When in its growth stage, it grows upward forming a needle-like point that is strong enough to grow through asphalt. A pool liner is no match for the nutgrass as it pushes toward the sun with its super strong point. There is no pool liner made that can stop nutgrass. So the result is it grows straight through the liner of your pool. There can be anywhere from just one or two blades all the way up to a 20 or 30 blades. This depends on how much nutgrass is in the soil. This generally happens after we have had substantial rain. The bottom of your pool was treated with a nutgrass poison during the installation process, but nutgrass will “network” inside the pool from the outside (pictured)if the perimeter is not poisoned on a quarterly basis. The one foot perimeter around the pool should be kept clear of vegetation by applying a product like ORTHO TRIOX.(Also sold as Ground Clear)
Usually only a few blades grow through the liner, but there can be more. Over the years I’ve seen extreme cases of nutgrass intrusion that amounted to twenty or more blades growing everywhere on the bottom of a single pool. It’s a very odd sight when you look into a pool and it has perfectly healthy, green grass growing in the water. I said earlier that nutgrass won’t ruin a liner. Nutgrass almost always starts near the inside wall of the pool and can slowly work its way out to the middle of the pool. Black plastic or weed cloth does not even slow it down. (pictured)