18x28x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack Nutrients and Supplements pH levels outside recommended ranges

pH levels outside recommended ranges can lead to nutrient lockout and nutrient deficiencies resulting in stunted growth and poor appearance

Simply select your day cycle and your wanted lighting period

which is contributed by thousands of ReefCentral members

an air stone that helps aerate the water

18x28x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack Nutrients and Supplements pH levels outside recommended rangesNordic Pure Custom MERV 10 Plus Carbon air filters are made based on the actual measurements so be sure to measure your current filter to get the EXACT dimensions before ordering. As with all Nordic Pure filters, the effective life of your filter depends on the environment in which you live. We recommend changing 1 and 2 filters every 30 90 days. Our 4, 5 and 6 inch thick filters could last up to 6 months. EXACT MEASUREMENT: Furnace and air condition