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http://indianaquariumhobbyist.com/community/ :: View topic - Planted Display Tank: Design & Development
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Planted Display Tank: Design & Development
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Madan
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PostPosted: Wed Apr 12, 2006 9:28 am Post subject:  Reply with quote

 Now  for  that  Modified  External  CO2  reactor  I  have  been  talking  about.
 
 Get  one  of  this  from  the  market
 
 
 
 Take  a  piece  of  acrylic,  heat  it  with  a  cigarette  lighter  and  bend  it  as  shown  to  make  a  hang  on  the  glass  stand.
 
 If  your  reactor  is  going  to  be  placed  inside  a  cabinet  and  concealed  the  bending  will  not  be  required.  You  can  screw  this  acrylic  directly  in  position  to  make  a  strong  fixture.
 
 
 
 The  reactor  comes  in  4  four  parts  and  can  be  dismantled.
 I  have  glued  the  3  parts  together  -  see  the  discoloration  where  the  super  glue  has  been  used,  and  left  the  top  part  free  for  dismantling  and  cleaning  the  reactor.  Make  sure  the  4  protrusions  that  will  be  used  to  fix  the  reactor  are  in  a  straight  line,  before  gluing  the  3  parts  together.  Also  make  sure  the  water  outlet  openings  is  almost  diametrically  opposite  to  the  fixing  protrusions.
 
 
 Now  fit  the  2  suction  cups  on  to  the  protrusions,  apply  on  bit  of  superglue  to  the  underside  of  the  suction  cups  and  press  the  assembly  to  the  acrylic  plate.  There  should  be  no  glue  used  between  the  reactor  and  the  suction  cup!  You  will  now  get  this.
 
 
 
 Your  external  reactor  is  now  ready.
 
 CO2  enters  from  the  top,  passes  through  the  plastic  tubing  inside  the  reactor  and  enters  the  reactor  from  the  bottom.
 
 Water  from  my  Eheim  is  led  into  the  reactor  from  the  top.
 The  water  exits  the  reactor  to  the  tank  from  the  bottom.
 
 
 
 The  reactor  is  of  Chinese  make,  variations  of  this  are  readily  available  in  the  market  and  cost  very  little.  The  important  thing  to  remember  is  to  have  water  flowing  top  --->  bottom  and  CO2  flowing  reverse  bottom  --->  top.
 
 The  impediment  to  water  flow  are  baffle  plates  in  this  case,  they  may  well  be  bio  balls  or  some  such  variation,  to  create  turbulence  inside  the  reactor  and  aid  in  dissolving  CO2.  I  expect  100%  dissolution  of  CO2  with  this  reactor.
 
 You  can  remove  the  reactor  from  place  for  cleaning  by  simply  pulling  it  out  of  the  suction  cup  and  fix  it  back  once  cleaning  is  done.


Last edited by Madan on Wed Apr 12, 2006 10:31 am; edited 1 time in total
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Madan
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PostPosted: Wed Apr 12, 2006 10:12 am Post subject:  Reply with quote

 By  the  way,
 
 This  reactor  will  make  an  excellent  Calcium  reactor  in  a  reef  setup  too.
 
 Enjoy!
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sen
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PostPosted: Wed Apr 12, 2006 12:34 pm Post subject:  Reply with quote

 Hi  Madan,
 Are  you  using  2  Dymax  CO2  internal  reactors??  can  you  let  us  know  the  approximate  cost  involved  in  building  this?
 
 Thanks,
 G.Senthil  Kumar
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Madan
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PostPosted: Wed Apr 12, 2006 12:56 pm Post subject:  Reply with quote

 I  wouldn't  know  the  brand  name,  there  is  another  model  half  this  size.  So  I  am  not  using  2  of  anything.  The  packaging  is  all  Chinese  or  Taiwanese.
 
 I  picked  this  reactor  up  in  Singapore  for  a  pittance,  it  may  cost  a  bit  more  here  is  my  guess.
 
 I  am  told  this  is  available  in  Chennai,  Bangalore,  and  other  places,  You'll  have  to  check  out  the  price.
 
 The  cost  involved  in  building  this  -  should  be  easy  to  guess,  about  Rs.  30/-  more  for  the  Superglue,  the  strip  of  acrylic  and  a  candle  +  matchbox,  after  you  get  the  reactor.
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amitava
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PostPosted: Wed Apr 12, 2006 3:05 pm Post subject:  Reply with quote

 Hi  Madan,
 
 This  is  excellent.  But  what  about  the  impurities?  Will  not  they  build  up  at  the  top  of  the  reactor?
 
 regards
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vkv
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PostPosted: Wed Apr 12, 2006 3:19 pm Post subject:  Reply with quote

 As  I  understand  it,  the  input  to  the  reactor  is  from  the  output  of  the  Eheim  so  hopefully  no  impurities  Smile
 
 Regards,
 Venkat
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Madan
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PostPosted: Wed Apr 12, 2006 3:22 pm Post subject:  Reply with quote

 Amitava,  the  reactor  can  be  dismantled  for  cleaning  from  the  top.
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PostPosted: Wed Apr 12, 2006 3:24 pm Post subject:  Reply with quote

                                                   
vkv  wrote:                
As  I  understand  it,  the  input  to  the  reactor  is  from  the  output  of  the  Eheim  so  hopefully  no  impurities  Smile
 
 Regards,
 Venkat                

 
 You  do  have  some  algae  build  up  in  a  reactor  every  few  months.
 This  is  unsightly  and  cleaning  is  required.
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Madan
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PostPosted: Wed Apr 12, 2006 3:28 pm Post subject:  Reply with quote

 Let  me  be  a  bit  more  clear  here.
 
 The  reactor  is  in  four  pieces,  I  have  already  glued  together  3  pieces  (the  bottom  three,  the  fourth  piece  which  is  the  top  piece  can  be  dismantled  and  the  whole  reactor  can  be  cleaned).  That's  why  I  photographed  it  with  the  4th  piece  open.
 
 
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nishantvats
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PostPosted: Wed Apr 12, 2006 3:31 pm Post subject:  Reply with quote

 I  have  a  feeling  amitava  was  asking  about  the  impurities  in  the  co2  feed  (gases  that  might  not  be  as  soluble  as  co2  itself,  and  don't  have  an  escape  route  from  the  reactor).  What  about  the  co2  that  doesn't  get  dissolved  by  the  time  it  reaches  the  top...  assuming  that  does  happen?
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PostPosted: Wed Apr 12, 2006 3:43 pm Post subject:  Reply with quote

                                                   
Quote:                

 You  do  have  some  algae  build  up  in  a  reactor  every  few  months.  
 This  is  unsightly  and  cleaning  is  required.                

 
 Would  wrapping  the  entire  thing  in  thick  paper  or  putting  it  in  a  box  so  that  it  does  not  get  any  light  help?
 
 I  guess  algae  growth  should  be  reduced  or  eliminated  if  there  is  no  light  hitting  the  reactor.
 
 Regards,
 Venkat
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PostPosted: Wed Apr 12, 2006 3:46 pm Post subject:  Reply with quote

 The  CO2  that  does  not  get  dissolved  before  it  reaches  the  top  will  remain  as  bubbles  at  the  top  being  constantly  agitated  by  the  incoming  water  till  it  dissolves  completely.
 
 As  for  impurities  in  CO2,  it's  negligible.  I  have  never  seen  any  problem  ever  with  that.  With  CO2  shut  off  and  the  water  left  on,  I  never  see  any  "impure"  bubbles  floating  around.
 
 Yes,  in  the  afternoon  when  the  oxygen  is  saturated  in  the  water  there  will  be  oxygen  diffusing  into  the  reactor  (  it  works  both  ways),  you'll  see  it  as  a  few  large  bubbles  swirling  around,  I  don't  bother  with  this  as  by  the  next  morning  when  the  plants  utilise  oxygen  at  night  these  oxygen  bubbles  diffuse  back  into  the  aquarium  water.
 
 You  will  not  believe  this  until  you  have  a  thriving  planted  tank  under  MH.
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PostPosted: Wed Apr 12, 2006 3:48 pm Post subject:  Reply with quote

                                                   
vkv  wrote:                
                                                 
Quote:                

 You  do  have  some  algae  build  up  in  a  reactor  every  few  months.  
 This  is  unsightly  and  cleaning  is  required.                

 
 Would  wrapping  the  entire  thing  in  thick  paper  or  putting  it  in  a  box  so  that  it  does  not  get  any  light  help?
 
 I  guess  algae  growth  should  be  reduced  or  eliminated  if  there  is  no  light  hitting  the  reactor.
 
 Regards,
 Venkat                

 
 Too  much  of  a  bother.  Go  in  for  a  fully  DIY  opaque  setup  in  that  case.
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PostPosted: Wed Apr 12, 2006 3:55 pm Post subject:  Reply with quote

 Hi  nishantvats
 
 
 You  got  me  correct.  I  was  talking  about  those  impurities  only.
 
 Madan,  
 
 I  am  using  food  greade  co2  but  that  has  also  a  lot  of  impurities  which  doesn't  dissolved  like  co2.  In  my  inline  reactor  (Barr's  Design)  there  is  a  escape  route  for  that.  
 
 If  I  dismantle  the  reactor  daily  to  release  the  impurities  then  it  is  a  painful  task  IMO.
 
 I  think  if  you  fix  a  small  tube  on  top  the  reactor  with  a  cap,  then  you  can  stop  the  filter  ones  and  release  the  gases.  I  can  be  totally  wrong.
 
 regards
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PostPosted: Wed Apr 12, 2006 4:04 pm Post subject:  Reply with quote

 Yes,  Tom  Barr  talks  of  outgassing  (or  some  such  term)  the  reactor.
 I  ignore  it  as  I  feel  it  is  not  a  problem.
 
 It's  been  a  week  I've  used  this  particular  reactor  and  10  days  of  the  larger  one  I  posted  a  few  days  ago,  plus  an  internal  glass  reactor  that  Rufus  has  for  over  4  years,  I  see  excess  gas  in  all  the  reactors  every  afternoon.  I  believe  it  is  oxygen  from  the  water  diffusing  into  the  CO2  bubble  the  same  way  as  CO2  bubbles  diffuse  in  to  the  water,  I  ignore  it  and  leave  it  alone.  In  the  morning  I  have  a  few  CO2  bubbles  left  in  the  reactor  jumping  around.
 
 I  have  never  ever  had  to  need  to  outgas  my  reactor,  I  only  touch  my  reactor  when  there  is  too  much  unsightly  algae.
 
 My  plants  don't  mind  it  too.  Very Happy
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