The slight clouding of the water is most likely due to calcium precipitation during mixing. This is totally harmless and will have no lasting effect on the aquarium.

To help avoid this in future the following pointers should help.

1. When opening a new bucket of H2Ocean dry mix the contents preferably in two separate buckets before bringing the salt back together for a final mix. During transport some of the elements in the salt can start to settle out due to atomic weights of the elements and vibration caused in transit.

This can lead to higher calcium levels at the top of the bucket which in itself can bias the mix to precipitation.

2. When mixing use a pump that doesn't get warm and mix the salt into cold or room temperature RO water. If mixing into warm RO or if the salt comes into contact with a heater or warm internal impeller chamber of a pump calcium carbonate seed crystals can form on contact resulting in cascade precipitation. Onced mixed and at the correct salinity, warm the salt mix to aquarium temperature before adding.

3. Mixing the salt for extended periods can also cause some precipitation. During prolonged mixing of more than 24 hours CO2 can be pulled into the mix  and bias the carbonate alkalinity into bicarbonate. This can also trigger a little precipitation in itself.

This will always be a possible side effect when mixing a salt with correct levels of Calcium, Alkalinity and Magnesium. Unlike salt with lower levels the percentage of these elements will obviously be higher meaning careful mixing should be observed to keep these in solution.

Our advice to help provide you with clear mix would be to mix the salt into cold RO carefully over about 20 mins to help prevent localised super saturation of salt piling up in the mixing vessel. Use a strong pump that doesn't get hot and mix the water for 3-4 hours before use. Heat the water to aquarium temperature and use within a few hours to avoid pulling in too much atmospheric CO2 into the mix.

As a natural base salt is used in our pro formula the produced saltwater is ready to use soon after mixing unlike synthetic salts made from scratch, these can tend to remain slightly caustic for sometime after initial mixing.

When adjusting salinity we also suggest using a refractometer designed for seawater rather than brine as these refractometers will measure seawater incorrectly.

We reccomend a salinity of 35.5PPT when using H2Ocean Pro Formula Salts.