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I use a homebrew version of Potsil which contains 34% potassium silicate. 0.2ml per litre (0.75ml/us gal) provides 18.2ppm K and 21.5ppm Si. The commercial stuff retails at around £18/litre, which is at least 20x more than it costs to make.. 

They look neat. Cycle timers are hard to find here so i have to make my own. The basic timers with a couple of 12-way rotary switches provide selectable timing increments, 12 steps for (on) and 12 steps for (off) which is plenty for most applications. I use a homebrew pc based software timer to...

Your cuttings will think they`ve checked into the Ritz ;)   Mine just get plain old tapwater, no ph adjustment or additives.

I`m on limestone, 650+ ppm and hard as nails.

Cheers TXCG   It was one of those ideas where everything just fell into place. The pump was on special offer and the accumulator was an ebay bargain, £30 + delivery. I should have bought a lottery ticket that week  ;)   

Thanks mate. It doesnt take much muscle power, its not much of a workout.. more tedious than tiring. I have 12 purple netafim coolnets in each root chamber.  Here`s the update pic . .

Cheers Mike I wanted a large outdoor setup that was immune to power failures with low maintenance. It takes about 5 minutes a day to maintain which isnt any great hardship. This is the root chamber i`ve had to mist more often than usual. I positioned it to get full sun most of the day and then a...

Hi Mike My hpa design is similar to yours, except its an outdoor and it runs completely offgrid. The heart of the system is a large accumulator that is manually charged from 80-140psi every 2 days. The accumulator feeds two 16ft x 2ft  (420gal) root chambers via pressure reducers and buried...

Hey Mike Your system looks well designed so its unlikely to let you down. My outdoor hpa setup runs for months without missing a beat,  We have a mini heatwave here with air temps well over 32C, the lid of the hpa is over 40C even with shadecloth  ;)  The plants and roots are doing ok even...

Hey Mike Sorry to hear about the loss of your plants. I guess you may have used too much as i routinely add bleach (5% sodium hypochlorite) to the res with no ill effects.. The most i`d use for an active issue like root rot is 5ppm, or 1ml of 5% bleach per 10L of res.. As a routine preventative...

I doubt it. How is the run off PH in relation to the feed PH, higher or lower?

I`ve never been one for quantity :) Imho, the underlying issue is the mist doesn`t create any appreciable runoff to carry away the excess and it quietly accumulates in the rootzone until it reaches a toxic level. Any symptoms occurring after a period of relatively problem free growth will likely...

Hi Thats a nice aero setup. The black spotting and curling could be indicative of a magnesium excess. It can show up as a potassium and/or calcium deficiency even though there is plenty of both in the solution. I had similar spotting affecting older leaves and put it down to magnesium building...