M METERXITY Grow Sponges, Inch Replacement Root Growth Posted on August 26, 2026August 25, 2026 By Maggie Poissant No Comments on M METERXITY Grow Sponges, Inch Replacement Root Growth Review Boost your hydroponic seedlings with M METERXITY’s premium peat grow sponges—engineered to expand, retain moisture, and hold shape for flawless rooting. Easy to soak, store, and use for vibrant growth.