subsea Posted March 8, 2012 Share Posted March 8, 2012 Use return weir flow from HOB filter with air bubbles indicating lower level. Bubbles increase as level drops and bubbles will decrease when level is increased, unless your air pump bubbles are going into the suction tube into pump impellar. Then many micro bubbles for special effects. One should combine this with undulating blue and red LED's for that special effect we strive for. Come back for more knowledge from the "school of hard knocks". When you have finished with that degre program, then you can say that you are "Old School". Patrick Link to comment Share on other sites More sharing options...
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