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Message: [QUOTE="crsublette, post: 181025, member: 3847"] It is an exaggeration when stating "[B]no algae[/B]" as validated from these pictures that you've shared clearly depicting carpet algae and a floating slime algae. Then, for the readers, notice the [B][U]tremendous[/U][/B] volume of plants versus the ratio of pond surface area, which proves the point I've been trying to make that [U]volume matters[/U] with this type of biofiltration. [URL="https://www.gardenpondforum.com/topic/11073-blue-herons/#entry168932"]Pics1 (in bog)[/URL], [URL="https://www.gardenpondforum.com/topic/11161-share-spring-photos-here/page-10#entry170056"]Pics2[/URL], [URL="https://www.gardenpondforum.com/topic/9532-pond-in-frederick-md-2012/page-24#entry177561"]Pics3[/URL]. I can find more pictures showing this. I bet ya if ya took an underwater camera picture of the growth underneath the lilly pads and on the stems or any free floating roots then you would notice a type of very small [URL="http://www.theplantedtank.co.uk/algae.htm"]brown diatom algae[/URL], that flakes away like dust, which almost looks like a bio-film; after my maintenance program, this is the only algae found in my pond other than the slime algae in my stream (that I try to keep algae in my stream). Also, you [U]can not discount[/U] the potential algae you will not see due to the fish feeding on the algae as well. Correct, it is [B]not[/B] the aesthetically [I][U]dis[/U][/I]pleasing form of algae but it is [B]still algae[/B], which again proves my point that there is simply different species of algae encourage to grow although may [B]not[/B] be proliferate. [B]This is a good thing and what we are aiming for!![/B] This is a good thing since some algae's and fungi's have a symbiotic relationship with plants to help make nutrients more soluble and provide complex sugars to the plants. This same result, lack of green water and very limited algae, is seen as well in aquaponic grow bed systems. I would [B]hope[/B] your results are replicated for everyone's pond with a bog, but, folks, do not be surprised when that is not the case since it all [U]depends on the ratio volume[/U] of plants versus the pond. I don't understand what the beef here is in regards to this issue and is a reason why I don't talk biofiltration. Just trying to look out for those potential bog owners and readers that may end up with a result that [U]may not be representative[/U] of your picture and to tell them [B]not[/B] to give up on the idea. Also, I believe in your situation, best I can recall from memory, you do [B]not[/B] use any UV device [U]nor[/U] do any major water changes other than the water change performed by heavy rain fall, and you have a significant volume of oyster shells as well and all of this does help the situation. Addy, I have always admired and loved your bog and the results you obtain from it, but lets not kid our self about what is happening here behind the scenes and why it is working as it does work. [/QUOTE]

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