water level indicators for keeping house plants in expanded clay leca pellets in passive hydroponics

aggregate background baked ball ballls botany brown chalk clay cutting expanded gardening gravel growing growth help house houseplant hydro hydroculture hydroponics indicator indicators insulation irregular isolated keeping leca level nature object organic passive pebble pebbles pelleted pellets plant plants pot propagation regulation root roots semihydroponics soil subirrigation system tool water white