View Full Version : Cleaning Lava Rock

08-16-2013, 06:09 PM

I have a lava rock which has previously been used in an aquarium, but now it has been lying around the house for a few years.
It has a thin layer of dried up algae on it, and it is in general not very clean. So now I am wondering how to go about cleaning it.
I realize one cannot boil it, because it would break apart. How do I prepare this rock for reusing in my aquarium?

- Norwegian aquarist

08-16-2013, 06:27 PM
Hell0 N0RWAY, welc0me! Try s0aking in h0t water f0r a while and then it might require using a stiff bristle brush and s0me g00d scrubbing and rinsing.G00d Idea t0 av0id b0iling, the h0les in it might make it bl0w apart 0n y0u, w0uldn't want any harm t0 y0u.

08-16-2013, 07:45 PM
Before you soak it, throw it in the oven at 400* for 45 mins and let it cool down to room temp. Then i would soak ot in a vinegar water solution for a day or 2. That should take care of most of that algae. Then brush it down and give it few days soak in dechlorinated water. Should be fine aftee that

08-17-2013, 01:17 AM
we use lava rock in our pond filter. to clean it, we soak it in warm water for an hour or so, then powerwash it outside. comes out clean as new.

08-17-2013, 10:39 AM
Thank you all for your quick replies!

After soaking the rock for a few hours, several tiny "bags" of old snail eggs reappeared on it. I don't know if these can still produce live snails, but I have a feeling these snails can live through pretty much anything. So I think I might try throwing it in the oven for a while first to get rid of all the possible snail eggs hidden inside it, then giving it another round in hot water and a good scrub.

Thanks ;)

- Norway

12-31-2014, 08:05 PM
I have about a hundred pounds of Lava Rock,use to be so pretty and white,eh,not so much now,have not had any success cleaning it.Even took it to the car wash.

12-31-2014, 08:14 PM
The car wash? Hope you aren't planning on putting that in a tank with plants or fish. Not sure what the cleaning products will do to the water. Even if you think its gone its going to still be in the rock, its so porous.

01-10-2015, 03:29 PM
Use a chlorine solution to ensure that any organisms are dead. One teaspoon (5mL) per gallon should be sufficient to sterilize. Once it has soaked in this solution for a day, rinse the rock thoroughly in warm water and then soak in a bucket of warm water (dissolves any remaining chlorine) for another day. Rinse one more time. If you want to be extra cautious, repeat the plain water soak with a new batch of water for another day.