Advanced water test series: resealable reaction for use with Proaquatest pH 7.4-9.0, ideal for determining the optimal pH value for fresh and sea water as well as ponds Recommendation for use: 1 week daily, then once a week Box contents: 1x JBL water test refill pH 7.4-9.0 for JBL proaquatest pH 7.4-9.0
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