Grove Co. Toilet Brush Head Refill
"I love the whole set, really! Also have bought for housewarming gifts (sounds funny, but they have also loved it!). Love the darker brushes as they don’t show any staining and because the whole set allows it to drain better, it’s a double win. I have NOT had the bristle falling out issue and we have several (wondering if that was just a bad brush). As you’ve probably read with other reviews, it gets up and under better. Get it. Get the set...but leave some for me" — cynthia s.