We enclosed “Simple PPM check paper(15pcs)” for 4L&20L product range. To check effective & adjective PPM, nax would like you to use our JIAnax with more peace of mind by being able to easily check the attached color chart . Please use it by all means!!
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–JIAnax for refill 4L（Dilution use）
–JAnax 20L Bag-in-Box type （Dilution use）