Hi Victor, 1) I am using Kati & Ani # 5 Before I made my decision to purchase this units, I contacted the manufacturer in Germany and he was so kind and explained to me the difference between # 2 , # 5 and # 10 I still have his explanations and if you are interested I will pass it on to you.(in english) 2) Well, I don't have one ! Thats why I filter over activated carbon and Filter Floss (Pillow-stuffing-polyester, way cheaper!) 3) I use 4-5 Tablespoons of caustic soda flakes and 2.5 Liter of muratic acid I hope this helps and if you have further questions, please contact me off list. Juergen The Eng Family wrote: > Hi Juergen, > > Just a few questions: > > 1. what size Kati & Ani are you using? > 2. do you know what level of TDS (total dissolved solids) is in your water? > 3. how much acid & caustic soda flake do you use per recharge? > > Cheers, > Victor Eng Vancouver, British Columbia, Canada > engfam@axion.net > > ------------------------------------------------------------------------- > This is the apistogramma mailing list, apisto@listbox.com. > For instructions on how to subscribe or unsubscribe or get help, > email apisto-request@listbox.com. > Search http://www.digital.com for "Apistogramma Mailing List Archives"! ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@listbox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@listbox.com. Search http://www.digital.com for "Apistogramma Mailing List Archives"!