It won't stay that high for long and it is not unsafe to swim in although if it is 10 (which I doubt) then you would want to wear an old swimsuit. Pools without CYA in them lose chlorine fast. After you use dichlor for a bit, your CYA will build up and you won't be losing chlorine so fast. (I'm not quite sure what you mean by 5 10, though.)

Although you should do yourself a favor and order the good Taylor K2006 kit, for now, you can force your kit to read chlorine readings higher than 5 with a dilution method. Use distilled water for this and not tap water. Info here: Testing Without a Good Kit

You might want to take a minute and read the Best Guess Chlorine Chart in Ben's signature above. It explains the connection between chlorine and CYA readings.

Have you read the 'recipe' for starting an Intex pool? http://www.poolforum.com/pf2/showthr...p-routine-care.