Hence it is useful information to help tune high PAR settings to shorter lighting period. Some setups have higher powered lights capable of reaching very high PAR & vice versa. With the PMK, we can use the data to easily calculate DLI (Daily Light Integral) – total PFFD over a 24 hour period. (read as micro mole per second per square meter) Strictly speaking, what we measure with the PAR meter is PFFD (Photosynthetic Photon Flux Density) – which is PPF over a specific area. Unit of measure is μmol/s (read as micro mole per second) PPF (Photosynthetic Photon Flux ) is the term used to define the measurement of PAR over a period of 1 second. Typically between 400nm to 700nm of the light spectrum PAR stands for “Photosynthetically Active Radiation”’ and refers to the wavelength of light that is used for photosynthesis. Also with the ASM module that comes in the kit, its now possible to integrate other commercial sensors to the Apex. Now able to measure PAR throughout the day. Got an Apex PMK (PAR measuring kit) recently. With the RO membrane also replaced, TDS readings i'm getting are : All clear! Then attach the sediment filter back to the system. This is how much carbon dust comes out for the initial 5L of waterĪfter 20L. Water inlet -> Carbon filter 1-> Carbon filter 2 -> Sediment filter -> Booster Pump -> RO membrane -> DI resin 1 -> DI resin 2 -> Water outletĪfter swapping out the filters, i disconnected the hose after carbon filter 2 to let the carbon flush out. So in total about 500L passes through the carbon/sediment filters per month. The filter produces about 200L waste water.
This will deplete the DI resen very quickly ($$$)īased on rough count, i use about 300L of clean water a month for water change & evaporation top up. Quite important to ensure the carbon filter are not depleted else chlorine will simply pass through the carbon filters. Ideally I should change them every 6 months to 1 year. Decided to change it after finding the TDS after the RO membrane is in the 18ppm range.Ĭarbon & sediment filter probably 18 months ago. Totally lost track of the last time the water filter filters were changed.