Daldorado SILENTFlow™ DPAS-10-WT 10" White Parallel Straight Perimeter Pool Grate - Daldorado’s SILENTFlow™ commercial pool grating system is the most superior evolution in parallel grating. All grating features the highest flow rate with an unprecedented 40% open area and whisper quiet noise reduction. All corners are custom manufactured by Daldorado and strengthened for inside-outside corners per project design requirements.