I use a large bottle of prime. I bought some off ebay and by the time I convert pounds to dollars it is about what BTT paid for his 'Kockney Koi Pond Dechlorinator'. I don't expect 500 ml to last me that long but it will last a good long time. My 250ml bottle from 2 years ago is more than half gone already and I have a lot more tanks now than when I got it. MTS lol.
/www.customaquatic.com/customaquatic...ndexid=ad-wc-cl







