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Pond circulation 6/21/07 Hi Crew, <Mike> My Mom has a pond containing 4000 gallons of water, a variety of flora, but mostly lilies, and some Koi and larger goldfish. There is also the annual migration of amphibians to the pond. <Nice> I have some of experience with aquaria, but I need to know the turn over rate for a pond of this size. <At least once per hour... twice is better, and the more "complete" (perhaps leaving the very bottom "level" for settling, venting...) the better> I believe she is "under-pumped" which is contributing (among other things) to the algae bloom she is complaining about. Thanks for your help, Mike <Is one factor... You/she have read here: http://www.wetwebmedia.com/PondSubWebIndex/pdalgcontrol.htm and the linked files above? Bob Fenner> Aeration in pond 6/29/05 I'm located in Connecticut and installing a submerged aeration system in a pond (approx 1/4 acre in surface size with aver depth of 5 feet). The pond is fed primarily by run off and is relatively still. 24 carps were placed in the pond 15 yrs ago and approx 16-18 are still alive. The person selling the aeration system says we can clean the hose twice a year by dumping a gallon of Muriatic acid thru the hose. Do you think this is safe for the fish? <Mmm, likely not a good idea... Our old service company (Aquatic Life Services) used to maintain several such systems... we found it far better to periodically (once a year or so) to "fish out" the mechanical diffuser (usually a glass-bead "air stone", and bleach it (laundry or swimming pool type) for an hour or so... rinse and re-install... the Muriatic (three molar Hydrochloric) Acid will likely damage the hose, perhaps the diffuser... and your lungs, clothes... btw, Aquatic Ecosystems sells replacements. Bob Fenner> Pond aeration Hello crew, <Karun> I have just started a small pond 5ftx5ftx1.5ft. I am using an Eheim filter that circulates 3000 litres /hour. <Great units... do just make sure the electrical connection is out of where it can get wetted> The pond has assorted plants. I also have about 30 mollies and guppies and 8 red tail black sharks (2 inches each) The pond does not have too much surface movement and no aeration. Will there be enough oxygen in the water? Should I increase the surface movement? <Good question... I would arrange the discharge "wand" to either discharge some of its "hole/outlets" above water, or at least for the water surface to be rippled by placing it, turning it to discharge near the water surface... alternatively, if you have the means, a good air-pump (my favorite choice, the Tetra Luft series) and maybe attach this to a sponge filter... would be ideal for both added aeration, some filtration, and redundant back-up. Bob Fenner>
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