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maxthedog2000
04-03-2016, 09:52 PM
I have used lava rock for filtration in my freshwater systems for some time. Have any of you used it in your sump before as part of your LR filtration? I use this type of stuff in freshwater:

quikrete companies 1175-05 .5 CUFT, Red Lava Rock, Hardscapes Graded Stone https://www.amazon.com/dp/B00FDXNP6K/ref=cm_sw_r_other_awd_lsEaxb0ZYC9JN

Carter

Manchestercity
04-03-2016, 10:14 PM
I have used lava rock in every tank I've ever setup. It's great for base rock. I rinse it throughly and have never had a problem. It's basically obsidian with trace amounts of iron.