greenspacegeek Refilling spray bottles from bulk concentrate has held up fine for over a year with no leaks, but getting the dilution ratio consistent without a graduated cylinder still leaves some batches too weak and requires a second pass on surfaces.
EcoWise Those weak batches point to needing a repeatable volume check without lab tools. Taping a line inside the bottle for the concentrate amount before adding water keeps the ratio steady batch after batch.
greenmindset EcoWise’s line inside the bottle should hold the ratio steady if the tape stays put through washes. It leaves less room for the weak batches that greenspacegeek ran into before.