I read your last post about having 1800ppm and this popped into my head, so I had to dig it up for you

Why you shouldn't pack on the nutes

500 ppm is workable but on the low side
1000ppm is average
1500ppm is definately saline(salt)
2000ppm is high

More isn't always better. your nutes hold a charge that attracts water molecules. The right balance allows for nute uptake and water uptake, but when there are excess nutes or too many for the plant to absorb the plant has to work really hard and compete with the nutes to break off the water molecule. This is because the salts creat a high osmotic pressure and the only way to relieve this pressure it to dilute itself with water. That's why we are so thristy after eating salty food it literally draws misture from us.

Since all nutrients are salts the more utrients tahat are in the plant water, the more salts will try and steal water away from the roots. As a result the nutrient value available to the plant changes as salinity(saltiness) raises. As well the nutes themselves compete each other for water, making the roots use more energy to get what they need. The more energy roots use on finding water, the less they have to use on actually production.

Personally IMHO I would recommend going no higher than 1500ppm