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Tired of the bath time battle? We’ve all been there. The pleading, the negotiating, the frantic search for a toy that hasn’t lost its charm. What if you could turn your regular bathtub into an extraordinary world of gooey, slimy, colourful fun that kids will beg for? Enter Gelli Baff and Slime Baff, the viral sensations from Zimpli Kids that are revolutionizing bath time for families everywhere. But beyond the vibrant social media posts, many parents have questions. Is it safe? Will it destroy my plumbing? And what’s the difference between the two? You’ve come to the right place. This is your ultimate guide to understanding, choosing, and enjoying the squishy, sensory world of Gelli Baff and Slime Baff.
What Exactly Are Gelli Baff and Slime Baff?
At their core, Gelli Baff and Slime Baff are unique, UK-made powders that magically transform a tub of plain water into a vibrant sensory playground. Created by Zimpli Kids, these products are designed to make bath time an exciting, tactile experience. But while they share a common goal, they offer two very different textures.
- Gelli Baff: This powder turns your bathwater into a thick, colourful goo. Think of it as a tub full of wobbly jelly. It’s perfect for squishing, scooping, and moulding.
- Slime Baff: This powder creates a thinner, stretchier, and oozy slime. It’s ideal for pouring, dripping, and running through your fingers for that classic, slippery slime feel.
Gelli Baff vs. Slime Baff: Which Is Right for Your Child?
This is the most common question we hear. Choosing the right “Baff” depends entirely on the kind of sensory experience your child enjoys most.
The Gelli Baff Experience (The “Squish” Factor)
If your child loves textures they can hold and compact, Gelli Baff is the winner. The thick, jelly-like substance holds its shape slightly, allowing kids to scoop it up in their hands, hide toys within it, and feel the satisfying squish between their fingers. It’s less about flow and more about dense, tactile play.
Best for:Â Kids who love playdough, kinetic sand, and squishy toys.
The Slime Baff Experience (The “Ooze” Factor)
If your child is fascinated by pouring, stretching, and watching things flow, Slime Baff is the perfect choice. The slippery, gooey texture runs over hands and toys, creating a wonderfully oozy experience. It’s more fluid than Gelli Baff and captures that quintessential slime sensation.
Best for:Â Kids who love classic slime, water wheels, and sensory pouring activities.
Answering Every Parent’s Concerns: The Nitty-Gritty
Okay, it sounds fun. But let’s get to the real questions every parent and homeowner has before turning their bathroom into a slime lab.
 Is It Safe for My Child’s Skin?
Absolutely. Safety is paramount, and Zimpli Kids products have an excellent track record. Both Gelli Baff and Slime Baff are independently certified as skin-safe.
- Dermatologically Tested:Â Assessed by experts to be kind and safe on the skin.
- Non-Irritant Formula:Â The formula is gentle and designed for play.
- Stain Free:Â No need to worry about your child turning into a little green alien. The colour easily washes off skin and hair.
 Will It Stain My Bathtub?
No. The products are certified stain-free. Once the play is done and you’ve followed the dissolution step, a quick rinse of the tub is all you need to leave it sparkling clean. No scrubbing required!
 What About My Drains? The Magic Dissolving Step!
This is the most ingenious part of the design. You are not pouring thick goo or slime down your drain. Each kit comes with a two-step process:
- Step 1 (The Fun):Â The Gelli or Slime powder that turns water into fun.
- Step 2 (The Magic): A second “dissolver” powder (pure table salt) is included. When you’re finished playing, simply sprinkle this into the tub. It instantly breaks down the goo or slime, turning it back into coloured water that can be safely and easily drained away.
Pro-Tip:Â Make sure you have enough water in the tub as per the instructions. This ensures the dissolver works effectively.
 Is It Environmentally Friendly?
Yes! Both Gelli Baff and Slime Baff are certified biodegradable, making them a responsible choice for fun.
More Than Just Fun: The Benefits of Sensory Bath Time
While the fun factor is undeniable, a Gelli or Slime Baff bath is also a powerful developmental tool. Sensory play is crucial for young minds, helping them explore and understand the world around them.
- Develops Motor Skills:Â Scooping, pouring, and squishing helps build fine motor skills and hand-eye coordination.
- Sparks Creativity:Â A tub of goo is a blank canvas for the imagination. It can be a swamp for dinosaurs, a potion for a wizard, or an alien ocean.
- Introduces STEM Concepts:Â Kids witness a fascinating (and safe) chemical reaction, learning about cause and effect as the water transforms and then changes back again.
- Calming and Therapeutic:Â For many children, the tactile sensation of playing with goo or slime can be incredibly calming and help them de-stress after a busy day.
The Verdict: Ready to Revolutionize Bath Time?
Gelli Baff and Slime Baff are more than just toys; they are an experience. They are a safe, easy-to-clean, and beneficial way to break the monotony of the daily routine and create joyful memories.
Whether you choose the squishy world of Gelli Baff or the oozy fun of Slime Baff, you’re not just adding a product to your cart—you’re unlocking a new level of play that will have your kids looking forward to bath time, every time.

This would make bathtime so much fun!
I eould love to win this for my daughter. She loves slime and I can see her having a ton of fun with this. Thanks! 🙂
Hi,I want to win this for my grandson I love that kids can get messy with slime baff and gelli baff and that’s certainly exciting for kids
I would love to win this for my grandchildren. Bath time would be a lot of fun with this. I love that Slime bath & gelli will be gentle to their skin but bring out their creativity and imaginations.
My grandson would love this for bathtime fun , anything to spend more time in the tub , looks like great fun !!
I love that it’s such a fun sensory experience. With 3 children ranging in different ages it would still be a lot of fun for everyone. Thank you for the chance.
My granddaughter would love this, she would think she is bathing in Jello, so much fun for an indoor rainy day boredom buster
I have 2 girls that would love to take a slime bath!
I’d love to win this for my grandkids and have a bath party with them! They would love the slime
I would love to win this for one of my little cousins. Slime and stuff are always fun for kids.
My kids would love this my son has additional needs so would be good to see what he thinks about it
This would have been fun to have when I was a kid. My grandchildren would love this stuff.