#### 1. Why and how do I calculate the SEED CONTROL FACTOR?

Why do I calculate the SEED CONTROL FACTOR?

What you are doing here is simply finding out what effects the PS you are using is having on the sample on which you are trying to determine the BOD_{5}

How to calculate the SEED CONTROL FACTOR:

Example: Assume you want to determine the SCF of a 25 ml sample of PolySeed

Initial DO 8.9

Final DO 4.4

Total Depletion 4.5 mg/l

The BOD of PolySeed is 4.5 x (300/25) = 54

The Seed Control Factor assuming you use 4 mLs of PolySeed solution added to a 300 ml bottle is

54 x (4/300) = 0.72

#### 2. Where can I find a BOD Calculator?

To access InterLab Supply’s BOD Calculator, please click here.

#### 3. Where can I find a CBOD Calculator?

To access InterLab Supply’s CBOD Calculator, please click here.