70's natureboy, Are you using Dyna Gro with NFT or RDWC ?
Nasty, that's my next move, try RO water.
I use filtered tap, but I also run 2 other RDWC with MasterBlend with no problem.
This is not for weed but it's weed fertilizers so hopefully someone can help.
I started an NFT system and ran it without plants to check for leaks.
2 days later this is what I saw...
It was MasterBlend at the time so I switched for General Hydroponic Flora I had left and same thing happened...
Knowing that P is about 43.6% pure and K is about 83% pure.
If I take Potassium Phosphate for example, which is approx P-52 and K-34.
Do I measure using 52-34 or do I measure using the actual 43.6 and 83% of 52-34 ?
Been using GH flora forever but this time I decided to try MasterBlend, so this is only a trial.
I start at 2.4 - 2.4 - 1.2 as suggested...... BUT I bring down the EC to 0.80 max. since day one (ph 5.8 to 6).
She drinks and eats like crazy.
She's a Girl Scout Cookie Auto at 4 weeks.
I also use...
Not sure about FRP panels, I use those post jackets. Cheap and easy to work with.
https://www.homedepot.com/p/Veranda-4-in-x-4-in-x-100-in-White-Traditional-Post-Jacket-73002149/100029112