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DIY RO water unit

 
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menonabhishek
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Location: HRBR, Bangalore

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PostPosted: Fri Jan 30, 2015 3:29 pm Post subject: DIY RO water unit Reply with quote

 So  Bangalore  has  it's  Up's  and  down's.  water  being  on  top  of  the  list  for  hobbyist.  
 
 Problem  Statement  :
 Till  now  I  was  putting  up  in  a  place  where  i  used  to  get  decent  water  but  now  will  be  shifting  my  house  to  a  place  where  the  TDS  of  water  is  high  (  read  700+  )  It's  borewell  water.  I  know  a  few  members  how  have  TDS  well  over  1200  in  their  place.  Sad  
 Presently  I  am  supposed  to  change  around  220  Liters  of  water  each  week.  It  might  go  up  in  future.  So  I  will  take  300L  per  week  as  a  base.
 
 Desired  State  :
 Given  the  choice  of  fishes  I  keep,  i  do  not  want  to  give  up  my  hobby  or  do  away  with  the  multiple  tanks  I  have.  The  only  solution  is  to  put  in  place  a  RO  system  to  do  the  job.  
 
 However,  it  seems  that  there  is  not  a  single  post  in  IAH  which  points  to  a  build  and  gives  directions.  I  found  one  post  in  KAC  to  help  me  but  that  was  too  kolkata  specific.  It  was  a  fantastic  starting  point  as  to  what  I  needed.  It  gave  me  the  confidence  that  a  DIY  was  possible.
 
 I  tried  searching  for  places  in  Bangalore  which  would  give  me  the  raw  materials  for  the  build,  but  that  too  failed.  I  was  dis-appointed  and  had  2  choices.
 1.  Go  in  for  a  commercial  RO  unit.  the  cost  estimate  that  I  got  from  2  companies  in  bangalore  for  a  unit  that  would  give  me  20-25LPH  was  17K  !
 2.  Search  online  
 
 So  my  search  went  further  and  I  have  come  up  with  the  links  of  things  that  I  require.  ebay  is  the  easiest  source  of  things  for  most  of  us  in  India.  If  you  all  have  a  better  source,  please  guide  me.  
 
 
 
 
                                                 
Quote:                
 Here's  the   link  to  the  original  KAC  post  if  anyone  is  interested.
 http://www.kolkata-aquarium.com/viewtopic.php?f=29&t=2985
                 

 
 
                                                 
Quote:                
 Pre-Filter  Housing
 http://www.ebay.in/itm/Pre-Filter-Housing-Standard-size10-for-10-spun-filter-RO-UV-water-purifier-/161568826239?pt=IN_Home_Appliances&hash=item259e40a37f
                 

 
 
                                                 
Quote:                
 5  Micron  Sediment  filter
 http://www.ebay.in/itm/RO-PreFilter-Kemflo-RO-Water-Purifier-Filter-Sediment-PP-spun-5-Micron-1-Piece-/121409932431?pt=IN_Home_Appliances&hash=item1c44988c8f
                 

 
 
                                                 
Quote:                
Pre-Carbon  Filter
 http://www.ebay.in/itm/RO-HiTech-Brand-Filters-for-Undersink-Model-GAC-CTO-For-Water-Filter-Purifiers-/271747435335?pt=IN_Home_Appliances&hash=item3f4568cb47
                 

 
 
                                                 
Quote:                
 RO  membrane
 http://www.ebay.in/itm/RO-Filmtec-75-GPD-DOW-Membrane-NEW-BW60-1812-75-Housing-For-Wate-Filter-Purifier-/271725627948?pt=IN_Home_Appliances&hash=item3f441c0a2c
                 

 
 
                                                 
Quote:                
 RO  booster  Pump
 http://www.ebay.in/itm/RO-BOOSTER-PUMP-KEMFLO-HF1800-BOOSTER-PUMP-FOR-RO-UV-WATER-PURIFIER-/161571358687?pt=IN_Home_Appliances&hash=item259e6747df
                 

 
 
                                                 
Quote:                
 Flow  Restrictor  
 http://www.ebay.in/itm/RO-Flow-Restrictor-450ML-RO-Water-Purifier-Filter-Flow-Restrictor-450ML-1-Piece-/251651493446?pt=IN_Home_Appliances&hash=item3a97990e46
                 

 
 
                                                 
Quote:                
 Housing  Mount
 http://www.snapdeal.com/product/ro-service-na-ro-service/145002517
                 

 
 
 With  this,  I  think  I  will  be  able  to  reduce  the  cost  by  around  50%.  But  I  have  a  few  doubts.
 
 So  here  are  my  questions.
 
 1.  Do  you  think  I  need  to  go  in  for  something  of  a  better  brand  ?  If  yes,  please  let  me  know  a  reliable  online  source.
 2.  The  good  booster  pump  I  found  is  rated  at  of  48V.  I  could  not  get  any  SMPS  higher  than  36V.  How  do  i  power  my  pump  ?
 3.  Do  I  also  need  a  solenoid  ?
 4.  Do  you  thing  this  will  reduce  my  TDS  under  50  ?
 5.  Just  as  a  conformation,  I  do  NOT  need  the  post  carbon  filer.  Correct  ?
 7.  will  adding  another  75  GPD  membrane  help  ?  I  saw  commercial  RO  with  2  membrane's.  Not  sure  what  the  2nd  one  was.
 
 
 regards,
 /abhishek
 9980169101
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Mortis
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PostPosted: Fri Jan 30, 2015 4:20 pm Post subject: Re: DIY RO water unit Reply with quote

 From  what  I  understand,  if  you  want  to  reduce  the  amount  of  water  wastage  and  also  increase  the  production  rate,  you  increase  the  size  of  the  pump  from  75  to  150  GPD  or  whatever  the  unit  is.  An  additional  75GPD  membrane  is  added  on  the  waste  water  line.
 
 Im  unsure  if  this  is  added  to  the  loop  which  is  removing  the  waste  water  out  of  the  system  or  the  loop  for  waste  water  that  goes  through  UV  etc  and  is  addied  back  to  the  drinking  water  to  boost  the  TDS/minerals/taste
 
 Now  your  other  scenario  is  if  even  the  RO  water  has  a  high  TDS  since  your  source  water  is  very  high.  Then  you  would  have  to  again  increase  the  pump  size  and  add  another  membrane  this  time  I  guess  in  series  after  the  main  RO  membrane  to  further  purify  the  water  or  possibly  to  the  waste  water  loop  that  goes  through  UV  to  add  back  TDS  to  the  RO  water.
 You  might  have  to  also  add  additional  chambers  containing  Ion  Exchange  resins,  water  softeners  and  another  stage  of  activated  carbon  to  further  bring  your  water  to  the  parameters  you  desire
 
 I  hope  I  managed  to  convey  my  points  to  you  in  a  way  that  you  can  grasp  easily.  Hopefully  it  wont  confuse  you  further  !
 
 My  suggestion  would  be  this  :  Get  an  assembled  filter  thats  a  copy  of  the  Kent  Grand  Plus.  These  are  available  online  for  less  than  10K.  Install  and  check  the  parameters  of  the  water  you  get.  Then  get  the  diaphragm  pump  of  the  Kent  Supreme  which  is  rated  150GPD  (grand  plus  is  75)  and  an  additional  membrane  and  replace  the  pump  and  add  the  extra  membrane  on  the  waste  water  loop  (you  will  have  to  figure  out  which  of  the  two  loops  I  mentioned  above  works)  and  thenyou  should  get  a  decent  water  quality  in  terms  of  TDS  as  well  as  the  amount  of  water  produced.  Im  sure  it  will  end  up  being  sufficient  for  your  needs.
 
 Please  share  the  progress  you  have  made  and  any  other  research  you  come  across.  I  myself  am  very  curious  to  know  which  loop  you  add  the  extra  membrane  to.
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shyamhegde
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PostPosted: Fri Jan 30, 2015 5:25 pm Post subject: Re: DIY RO water unit Reply with quote

 I  am  also  thinking  the  same  as  my  Kent  will  not  work  out  on  my  current  tank  and  high  TDS,  borewell  water.   At  the  moment,  I  am  finding,  buying  the  drinking  can  water  is  better  way.
 
 How  about  recycling  your  tank's  water  itself,  which  is  already  low  on  TDS  ?   I  am  not  sure,  if  this  is  a  good  idea  to  think  about.
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menonabhishek
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PostPosted: Sun Feb 01, 2015 3:30 pm Post subject: Re: DIY RO water unit Reply with quote

 Thanks  Mortis.  I  am  still  working  on  the  build.  There  have  been  few  friends  who  have  suggested  me  NOT  to  go  on  for  RO  but  bottled  water.  (  though  bottled  water  will  be  much  more  difficult  for  me  )  
 
 I  will  keep  you  all  updated.  Anyone  else  with  any  suggestions  ?
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pxk587
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PostPosted: Tue Jul 12, 2016 2:58 pm Post subject: Re: DIY RO water unit Reply with quote

 *******Sorry  Guys  to  dig  this  OLD  Post  on  RO  Unit*************
 
 Abhishek,  were  you  be  able  to  install  the  RO  Unit?  Did  you  DIY  them  or  bought  a  commercial  one.
 
 When  I  am  looking  for  a  post  on  RO,  I  found  yours  is  so  relevant  hence  opened  this  thread.
 
 
 Hi  All,  any  one  did  DIY  on  RO  Unit  recently,  please  share  the  details.
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shyamhegde
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PostPosted: Tue Jul 12, 2016 4:47 pm Post subject: Re: DIY RO water unit Reply with quote

 I  started  using  commercial  supplied  can  water  of  20  litres  .  Sold  in  my  area  between  30  to  40  rupees  a  can.  Working  on  planted  and  marine  without  a  problem  so  far.
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Mortis
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PostPosted: Tue Jul 12, 2016 6:50 pm Post subject: Re: DIY RO water unit Reply with quote

 As  you  can  see  I  tried  helping  but  he  did  not  report  back  on  his  progress.  It  should  be  fairly  simple  to  make  one  yourself  although  it  might  not  be  so  neat  looking  as  a  commercial  one.  Try  Pming  the  author,  dont  know  if  hes  active  on  IAH
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menonabhishek
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PostPosted: Wed Jul 20, 2016 4:36 pm Post subject: Re: DIY RO water unit Reply with quote

 Hello,
 
 Sorry  had  been  keeping  buzy.  I  did  make  the  RO  unit.  I  good  good  results  and  near  perfect  H2O.  Smile  
 
 I  also  got  a  few  contacts  who  could  supply  me  regular  spares.  I  think  they  can  even  assemble  a  unit  for  you  if  you  want.
 
 watsapp  me  if  you  need  more  details.
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Imran_sids
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PostPosted: Wed Jul 20, 2016 6:04 pm Post subject: Re: DIY RO water unit Reply with quote

 Hi,
 
 Could  you  please  let  us  know  how  much  it  cost  &  if  possible  pics.
 
 Regards,
 
 Imran  Sids
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menonabhishek
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PostPosted: Wed Jul 20, 2016 10:43 pm Post subject: Re: DIY RO water unit Reply with quote

 sent  you  a  PM.
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wads
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PostPosted: Thu Jul 21, 2016 1:15 pm Post subject: Re: DIY RO water unit Reply with quote

 Abhishek,
 
 Please  share  the  model  diagram  of  your  design  and  also  the  levels  you  are  steadily  getting.
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menonabhishek
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PostPosted: Thu Jul 21, 2016 2:01 pm Post subject: Re: DIY RO water unit Reply with quote

 I  shifted  my  house  around  4  months  back.
 
 Before  that  my  input  was  1000ppm  ..  output  was  around  60ppm
 
 Now  Input  is  250ppm  output  is  7ppm.
 
 Have  been  using  it  for  around  a  year  now.  Changed  1  pre-filter  because  water  in  my  old  house  was  very  very  dirty.
 
 Will  share  the  pictures  when  I  am  home  or  over  the  weekend  Smile
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pxk587
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PostPosted: Thu Jul 21, 2016 4:49 pm Post subject: Re: DIY RO water unit Reply with quote

 Thx  Abhishek  for  the  response  !!
 
 Please  provide  a  detailed  information  to  follow.
 
 Thanks,
 Mohan
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Mortis
Committed Member of IAH
Committed Member of IAH



Joined: Apr 14, 2006
Posts: 1968
Location: Mumbai

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PostPosted: Thu Jul 21, 2016 7:40 pm Post subject: Re: DIY RO water unit Reply with quote

 Please  share  details  on  this  thread  of  the  build  so  that  it  can  benefit  everybody
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