Polymers extend the watering cycle by a few days but once dry are useless unless you water again. Releases moisture over a predetermined period of time. Not affected by climatic conditions. Wind and high temp-erature will accelerate the release of moisture. Natural, food grade ingredients, safe around children and pets, and environmentally friendly.
Polyacrylimide polymers are a petroleum based product and therefore have some degree of toxicity.
Roots grow into the saturated polymer crystals and if allowed to become very dry will actually compete with the plant for moisture. Stays where you place it, at the rootball. With each watering, polymers work there way toward the surface, eventually eliminating any positive benefit. Stops releasing moisture when the soil becomes very wet. Won't contribute to root problems.