Triacs VS relays

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on ebay see lot of single relay boards, 8 channel relay boards, optocoupled relay boards, , on, never see triac boards. had project solenoid valves, switching them relays made lcd display go wonkey, used (bt139) triac instead. after worked fine.

why aren't triacs used more widely?  (it isn't particularly expensive, triac + optocoupler 2 dollars.)
|s there big disadvantage don't know of?

http://www.ebay.com/bhp/ssr-25da


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