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Personal Observation Tests Smell Place your hand in the water and then bring it up to your nose, does it smell fishy or "off"? Water should have an earthen smell, similar to the smell after a good rain on a summer's day. Fishy or strange smells, warrant further immediate water testing, as high Ammonia, Nitrites or Dissolved Organic Compounds (DOC) could be present.
Appearance Is your water cloudy, milky, green or brown? A simple test is to fill a clear glass with pond water and place a white paper behind the glass. Observe the color of the water, a slight green tinge is normal, cloudy, milky water may indicate a bacterial bloom, brown water indicates decaying plant material e.g. Tannins or iron rich water. Small particles FL in the glass indicate an inefficient, undersized or poorly maintained filter system.
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