$53.90
In stock (can be backordered)
Tap water may contain elements which are not in natural sea water and which can inhibit the health of marine animals. Since most marine aquarists do not have a supply of natural sea water readily available to them, most aquarists choose to create their own aquarium saltwater by mixing commercially available sea salts with the best quality water they can find. It has been found that using “pure” water (H2O) containing absolutely no contaminants eliminates any doubts about what may be in your water. RO/DI water has been found to meet this requirement.
RO/DI units have the DI as the final stage, and colour changing deionisation resin cartridges have the added benefit to reveal when the resin is exhausted. In Deionisation two types of synthetic resins are used, one to remove positively charged ions (cations) and another to remove negatively charged ions (anions). Cation deionisation (DI) resins remove cations, such as calcium, magnesium and sodium and replace them with the hydrogen (H+) ion. Anion deionisation resins remove anions, such as chloride, sulfate and bicarbonate and replace them with the hydroxide (OH-) ion.
In Deionisation, the displaced H+ and OH- combine to form H2O.
29 cm x 6 cm with 1/4″ female threads either end.
This cartridge takes about 380 g of resin to fill. We can also supply push-in fittings and brackets .
The colour changing resin will change from blue to light brown when the resin is saturated and comprises of a mixture of cation and anion resin.
Filling a DI Cartridge is easy. The most important thing to remember is to tightly pack the DI resin into the cartridge. Loose DI will cause the water to channel through the DI, greatly reducing the effectiveness.
Type 1 Strong based Anion resins release very low levels of amines (trimethylamine). A very low threshold of 5 PPB or greater will cause a fishy odour to be noticeable. The odour is most noticeable when the resins are new and when they are at or near the point of exhaustion. It is therefor recommended to flush a new DI- cartridge for a few hours to reduce the off-odour, however the small amounts of amines released will not harm the fish.
NOTE: Trimethylamine is also released by decomposing fish which also results in the same type of odour.
Why does my new colour changing deionisation cartridge produce water with a fishy small?
Type 1 Strong based Anion resins release very low levels of amines (trimethylamine). A very low threshold of 5 PPB or greater will cause a fishy odour to be noticeable. The odour is most noticeable when the resins are new and when they are at or near the point of exhaustion. It is therefor recommended to flush a new DI- cartridge for a few hours to reduce the off-odour, however the small amounts of amines released will not harm the fish.
Why does the DI-cartridge not fill all the way with water?
RO water is produced at a very slow rate, which is dependent on the water temperature, pressure and size of the membrane. The water trickles into the DI housing (on the outside of the DI cartridge) and is forced up through the center, leaving the DI housing.
There are two reasons that this housing will not fill with water. First, air trapped in the housing will not allow it to fill. Or, if the product line leaving this housing is sloped down, then you are gravity draining the water out of the housing. In either case, no harm is done to either the water or the DI cartridge.
Why does my DI-cartridge have a such a short life?
One of the most common reasons for low DI cartridge life is high carbon dioxide content in low pH waters. CO2 levels in low pH waters like well waters can be as high 50-100 ppm. Since carbon dioxide is a small dissolved gaseous molecule it passes right through the reverse osmosis membrane. Carbon dioxide is weakly ionised and is not detected in conductivity measurements, however it occupies the anion-exchange sites in the deionisation cartridge significantly reducing their expected life-time. Therefore, CO2 removal from RO product water significantly enhances the life-time of the deionisation cartridges.
Good CO2 levels are 15 -35 ppm. CO2 levels can be lowered by dispersing fine air bubbles into water with air stone or venturi side injection. Refer to Henry’s law .
To determine CO2 levels click on the link below:
How to determine CO2-levels:
| Weight | 2 kg |
|---|---|
| Dimensions | 25 x 10 x 10 |
