Get the 2 speed. Always, always, always.
Let's see: 18 x 33 x 4' deep => 17,700 gallons. Ideal flow rate for a cartridge is 0.375 gpm/sft (the 'commercial' rate . . . which is the ONLY real, tested, rate). Eight hour equivalent volume turn-over would be 37 GPM. A 150 sft can handle up to 56 gpm . . . so that would be ideal.
I can't find a minimum flow specification for the AquaTrol : http://www.hayward-pool.com/prd/Abov...1_14023__A.htm
Call Hayward and askContact us by phone:But the flow on low should be around 20 GPM, and should be fine for the cell itself. It *might* not be fine for the safety on the unit. I couldn't find in the manual any explanation of how the low flow safety is set up.
(908) 355-7995 (U.S.)
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By the way, that AquaTrol is BARELY big enough for your pool. SWCG life is DIRECTLY related to ON time. Buying oversized units means they last much longer. In your case, that might not be possible. But if you remember that the SWCG is just a METHOD of adding chlorine to your pool, you can make it last much longer.
1. NEVER use an SWCG for startup or for problems (like algae)
2. ALWAYS get the water RIGHT before turning the SWCG on.
3. Remember that the "BOOST" or "SHOCK" setting is sort of a "Kill me now!" setting for the SWCG. Pour a jug of bleach in, instead!
The best way, in your case, for a freshly filled pool, is to use our Super Simple recipe for a month: http://pool9.net/ssr/ This will not work for more than 2 months, but it will allow you get your pool up and running optimally while you learn GRADUALLY what's needed.
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