Filter Elements

z-Filter
Gradient-based z-filter
Heteronuclear z-Filter
zz-filter (Heteronuclear Magnetization Transfer)   
Multiple-quantum filter
  A T2 filter
Diffusion filter
Isotope Filters

X-filter
X Half-Filter  
Low-Pass J-Filter  
The BIRD operator  
The TANGO operator
Relaxation Filters

T1 Inversion-Recovery
T2 CPMG
T1rho
On/Off Heteronuclear NOE saturation

Gradient elements

A Pulsed-Field gradient  
Minimizing Phase errors using gradients   
Refocusing using gradients  
Inversion using gradients (Bipolar Gradients)
Heteronuclear Decoupling.

Solvent Filters

Solvent presaturation
Multiple Solvent presaturation
PFGs for coherence selection .
zz filter in HSQC-like experiments .
water flip-back approach.
WET scheme
WATERGATE Using 3-9-19
WATERGATE Using 90 water-selective pulse
Excitation Sculpting (ES) using W5
Excitation Sculpting (ES) using 180 water-selective pulse