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Originally Posted by PhilaGardener
Looks great - Thanks for posting this!
What sort of a float rig did you use for your reservoir? Are you adding nutrients to that (hydroponics)?
For mosquito problems, I wonder how long a BT "dunk" (for outdoor pools) would control the problem in a closed system like this (since the primary water loss is evaporation, it wouldn't get washed out).
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Hydroponics requires constant circulation of fertilizer liquid since the grow medium itself has zero nutrients (and cannot hold nutrients.) Since everything is planted in a potting mix, it can hold nutrients. Having the gutter just allows me to put the fertilizer there (Flora-nova) mid season if I think it needs a boost. For the first half of the season, I literally do nothing since every container has a top dressing of 10-10-10.
I do use BT dunks. I can't say how long it lasts but I think last summer I put in a 1/4 of a ring in each gutter every month.
The recommended float is made by Kerick and you want the adjustable arm one. The kerick brand is used in commericial/industrial applications so you know its a good one. I've bought others from online because I wanted a smaller float bulb and I can tell you the kerick ones are waay better. Anyways, if you watch Larry's videos, he tells you about all the parts. I find his videos highly entertaining.