slakey wrote:Hmm so Im in abit of a pickle then really... nothing that I can do about it.
Apart from RO, nitrazorb or Anaerobic bacteria is there any other way to reduce my nitrate?
In short, no. If there was a simple way to do that, it would be done by everyone owning an aquarium.
If not could someone tell me what you need to do to use RO water?
You need supply of RO water - either from your LFS or by purchasing an RO unit, which is connected (temporarily or permanently) to your water supply.
You will also need somewhere to store the filtered water, and a waste-drain for the waste-water (on unit of RO water produces about 5 units of waste-water). [The waste-water is fine for watering plants, flushing the toilet, washing the car, or anything else that doesn't require perfectly clean water - just bear in mind that it's no longer clorinated, so bacteria will grow more easily in the water].
An RO unit consists of a set of "pre-filters" (carbon filter and sediment filter). These remove unwanted chemicals (such as chlorine) and solid particles respectively. Then there is the actual RO filter, which is a "thin-film membrane", which lets through water molecules, but blocks most other things. It operates on a pressure differential, and uses the waste-water to flush away the unwanted matter.
Fancy units also have a water-softener, which converts hardness into sodium chloride to make it easier to filter in the RO membrane.
You can find RO units from about £60-70, and the smallest ones would be fine for your one or two mid-size tanks.
Finally, if you use RO water only, you will need to re-mineralise the water with trace-elements, and add something to keep the pH stable, and it's probably advisable to get a TDS meter so that you can keep track of the mineral content in the water.
Buying water from the LFS will set you back a few quid per 25l (plus a few more for the 25l container), and of course, every water change, you'll have to load up the car with a few 25l containers and go to the LFS - particularly annoying if you need an unplanned water-change [although that can also be difficult if you have a temporary setup of RO unit].
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Mats