Can I remove only a portion of the dry chemicals from FND20C to make less than 20L of solution?

Neutral detergent consists of varying amounts of 4 dry chemicals and triethylene glycol. 
If you remove only a portion of the dry chemicals to make less than 20L of solution, it is impossible to know if the solution has the correct ratio of chemicals. 

The only way to ensure that the chemical solution consists of the correct ratio of chemicals is to make all 20L at one time.