Key    : D
Standard EADGBe tuning

I think they omit the C# bass in the third verse.

Verse 1
D
Oh crimson flow once shed for me
                         A/C#
My life I owe my saving King
               D             
His blood has paid my ransom fee
Oh crimson flow that set me free

Chorus
D
Oh the blood of Christ
                  A/C#
Oh the blood of Christ
D                Bm
Oh the blood of Christ
     G     A   D
It washes over me

Verse 2
Oh crimson flow this solemn creed
That in my life I must decree
To tell the lost His Word and deed
Power to live in Christ our King

D   A/C#   G/B   A  D

Verse 3
Oh crimson flow the scarlet key
By which my soul at last shall see
The King above in all glory
With God most high I'll ever be