I have finished the second strawberry tower.
Changes/improvements from the first tower are:
increased plant capacity for same size tower,
relocation of nutrient supply line,
larger/more convenient nutrient reservoir.
Thanks for watching!
Per request, more info on tower construction:
Main upright square tube (cut length = 48 inches):
https://www.lowes.com/pd/Freedom-Common-5-in-x-5-in-x-8-ft-Actual-5-in-x-5-in-x-8-ft-Pre-Assembled-White-Vinyl-Fence-Blank-Post/4009495
Caps (qty 2 per tower):
https://www.lowes.com/pd/Freedom-Fits-Common-Post-Measurement-5-in-Actual-5-17-in-x-5-17-in-White-Vinyl-Fence-Post-Cap/4062631
Round pipe for plants (Length at long side = 4.5 inches):
https://www.lowes.com/pd/Charlotte-Pipe-3-in-x-10-ft-Sch-40-Cellcore-PVC-DWV-Pipe/3133045
PVC cement:
https://www.lowes.com/pd/Freedom-PVC-Fence-Vinyl-Cement/1000080201
Spacing on plant opening was 8 inches.
Growing medium (5 gallons minimum):
https://www.walmart.com/ip/Grow-t-Clay-Pebbles-10L-Bag/45856718?wmlspartner=wlpa&adid=22222222227033193670&wl0=&wl1=g&wl2=c&wl3=79434559751&wl4=pla-138031319111&wl5=9005411&wl6=&wl7=&wl8=&wl9=pla&wl10=8175035&wl11=online&wl12=45856718&wl13=&veh=sem&gclid=CjwKCAjw0JfdBRACEiwAiDTALvRTVGPlc8tBzutdrWUn6YWEjOPDsim_TX9r2b18P4cNtMzZbCXjUhoCSLgQAvD_BwE
Nutrient solution (ph of 6.5):
https://www.youtube.com/watch?v=vYv9iu2NI3M
ph meter.
You'll need ph up/ph down depending on your water.
Nutrient meter:
https://www.amazon.com/2018-New-Package-Hydroponic-Household/dp/B00PEDHSQC/ref=sr_1_2_sspa?ie=UTF8&qid=1537619184&sr=8-2-spons&keywords=nutrient+meter+hydroponics&psc=1
Pump, tubing, hose, fittings, container to hold nutrient solution, etc., etc., etc.
I recommend not installing on backside since there is minimal sunshine and strawberries need bright light.
These are extremely time-consuming to build; one full day for each tower.
You will need some type of jig to accurately cut oval holes in the square tube.
You will need to fabricate a sturdy support for the finished tower. I'll guess finished weight (with plants and growing medium) is over 30 pounds.
