Kohaku Koi House Sdn Bhd
5, Jalan Banang,
Taman Johor,
81200, Johor Bahru,
Johor, Malaysia.






Business Hours :  
By appointment only
Tuesdays to Fridays:
10.00 am to 6.30 pm
Public Holidays:

10.00 am to 6.00 pm

Our Business Associates:

Improve Filter System

Overview of koi ponds built within Johor

Based on our assessment, about 40% koi ponds are built with poor filter system and usually under-sized .  If the filter box was built too small (we recommend 30% filter to pond ratio) with not enough filter media in the filter chambers then one cannot expect to have clear and nice water for your koi.  

I was recently asked how to build a cheap and good koi pond.  My answer to that question was "to build it right the first time" !  There are many koi hobbyists here ended up having to spend money to redo their koi pond to correct inefficiency.

Here are some recent rectification works (including refurbish works) undertaken:

5.   Mr Boon of Sri Impian - Pond water leaks and water loss of 12" per day!  This filter supports two ponds and 
      is located at the rear of the house.  Main koi pond and a small fish pond are both about 40 metres apart from
      this filter.  Given the distant, it is not unusual for the bottom drain pipes or the PVC pipe linking the skimmer to the
      filter to spring a leak (more likely skimmer pipe) due to soil settlement.  

      It is safer to build filter boxes as close to the pond as possible to prevent such problems.  Also it is better for koi      
      wastes to move quickly into the filter box chambers than to travel such a long distant in the bottom drain pipes.
      Given the complexity of the water pipes installed from the filter box to the two ponds and with water cacasding wall
      and vases as water feature we first proceeded to do a complete re-filberglassing of the filter box and only the
      fish pond after confirming koi pond was holding water well.  It was subsequently established that the pipes linking
      the skimmers to both ponds were also causing this water loss problem not just the fiberglass coating!  To avoid
      major excavation to identify and repair the leaks, both pipes were sealed off.  This means the skimmer for the koi
      pond is now not useable.  As for the fish pond, a dedicated filter box was then built to support it. 

      In conclusion, it is crucial to build your filter box as close to the koi pond as possible.


     New filter box built besides the existing fish pond    Completed filter box with Balau wood cover


4.  Mr Jasmin - He purchased a house as a lodging place for staff from his other faraway offices.  This house came
     with a koi pond.  It needed some refurbish works to get it working and look new again.  We repaired water jets x 3,
     put in place water skimmer, fiberglassed the whole pond and filter and replaced all filter media and water pumps.  


        Before - Pond Overview                                    After                                      After - close-up

          Before - Filter overview              After - Filter media replaced           After - Filter Overview

3.  Mr Chin of Nong Chik - Simple action of replacing under-sized pipe from Tsurumi water pump from 25 mm PVC
     pipe to 32 mm improved the water being pumped to the waterfall and water circulation jets.  Before the change
     water was not flowing nicely from the waterfall unless one of the water circulation jets is turned off. 

     (The wrong use of PVC pipe by the contractor who built the pond - From 50 mm outlet of Tsurumi pump it was
       reduced to 25 mm PVC pipe and branched to 3 x 25  mm pipes to waterfall and water circulation jet x 2)

                                           Our staff Budi replacing the 25 mm PVC pipe with a bigger 32 mm PVC pipe

2.  Mr Haridass of Taman Johor - Mr Haridass's pond came with the house he bought.  We re-fiberglassed the
     whole pond and relayout the chamber partitions to create much wider space for filter media.  

     (The filter chambers were built very narrow leaving big space for the settlement and pump chamber and little space
       for filter media)


                                                               Before                                      After (widened space for filter media)

1.  Ms Koh of Taman University - We improve the pond to filter ratio from 18% to 25% by increasing the filter depth
     by 40 cm (16").   Re-layout the chamber partitions, PVC pipes and built a Dry chamber to allow customer to
     periodically discharge wastes to drain.  All exposed circulation PVC pipes are then concealed. Bottom drain
     pipe size increased from existing 3" to 4" diameter.  A surface skimmer was also installed.  The whole filter and 
     pond re-filberglassed to complete the whole project.

     (Per Ms Koh, her pond was handled by 2 other contractors before we were engaged to upgrade the pond.  View
      pictures below to better understand the difference.)


                           Before                                          After (still incomplete)                      After (Dry chamber)


                        Before                                                  After                                 After (Bottom drain)