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PLACE LAVA ROCKS WITH AIR SPACES BETWEEN THE ROCKS. DO NOT OVER LOAD ROCK GRATES.
Please Use The Following Amount of Lava Rock Per Model.
GCRB 18 = Approximately 3 LBS.
GCRB 24 = Approximately 4 LBS.
GCRB 36 = Approximately 7 LBS.
GCRB 48 = Approximately 9 LBS.
Notes:
