0800744c_Never_open_your_DayStar_Filter__Problems_seen_
[Typical Symptoms] A sligthly dirty filter can be blown off with Dustoff or a photo dust bulb. Be careful not to allow any liquid propellant to hit the glass surface. A very dirty filter must be sent back to DayStar for complete Clean and Check Service [Repair Cost:] Free to $45 [Problems seen:] 
Filter is dirty
F a i l e d B l o c k e r s & t r i m m e r s
F a i l e d h e a t e r
H e a t e r k n o b s e t t o o h i g h
F i l t e r i s d i r t y
" O p t i c a l ' g r e a s e ' h a s s e p a r a t e d "
S p i d e r v e i n s
E t a l o n d a m a g e
Never open your DayStar Filter
Problems seen: