GROW!T GMC40l - 4mm-16mm Clay Pebbles, Brown, (40 Liter Bag) - Made from 100% Natural Clay, Can be used for Drainage, Decoration, Aquaponics, Hydroponics and Other Gardening Essentials

If you require these, you already know what you need them for. The build quality is excellent. They are simple to setup and easy to use. They do an outstanding job of storing and transporting your water & nutrients. These are the golden standard of leca. Absolutely highly recommended.

Starting my semi-hydro plant journey and bought these. They're not like the perfect orange-y colored balls that you see some people using. These are a regular brown color and are more irregularly shaped, but that's fine for me because I had read it's actually easier to situate your plant in the irregular-shaped leca instead of the perfect balls. For the most part these haven't sunk after soaking them in water (even after soaking for weeks), but I don't think that really matters as far as actually using these for planting because none of the plants I've moved to leca have died and it's been a couple months now.

Even though I never really used it in my aquaponics system, I would still recommend it, because it's lightweight and it provides the roots of the plants and vegetables plently of oxygen.

Box size is 24" x 16" x 6".The bag weights 21.94 lbs of material.The granular media is highly irregular.

I normally buy leca in bulk but needed some ASAP so I ordered this bag. I didn't expect this bag to be huge but it is. I'd say there's 20 lbs of lecca in here at least! Definitely worth the $ I paid! Happy growing!

It worked enough for a second purchase. I washedf the crap pout of them and still dusty. So wash them....

Perfect

If you are looking for perfectly round pebbles, like on the photo on the bag, look elsewhere. I read the reviews, so I was aware of what I was getting. Most of the pebbles were irregular shaped and looked like odd lava rock, but that does not affect my hydroponics system. I use a combination of hydroton in the bottom of each tier of the system and then in the grow baskets surrounding my roots. I used to grow directly in the tiers, in perlite, but I have always enjoyed hydroton, and this way I also have more control over the root system so that it does not clog my system. I just ordered a 40 ltr bag because 10 ltrs was only enough to make a short foundation in each of the tiers of one system. Since I completely switched over from Perlite this year, I need a lot. I soaked first (see picture of pebbles in the pink tub) and then I drained and strained. Towards the bottom, I strained and rinsed again in the strainer. A lot of mud and residue comes off of these, so be sure to soak and rinse before adding it to your systems. Obviously, I will check pH once I get everything set up for the plants, as I know that having this much hydroton will likely change the water balance, but that is okay. I also used this same brand in an aquaponics system, and I grew strawberries, mint and chamomile successfully. The hydroton did not bother the fish.