Used, excellent condition SEAGULL Ⅳ Model X-1DS Water Purifier Set

This is a Seagull IV countertop water purifier set, originally purchased by my eldest son in May 2007 for ￥69,200 (current price is approximately ￥190,000).
It was actually used from May 2007 until September 2011, when we moved.
After that, it was passed on to my parents, but since the faucet it was meant to be attached to didn't fit, it was stored until April of this year. In April of this year, when I changed the existing sink water purifier to an under-sink type, I considered if this could be used. I cut the raw water supply hose midway and attached a quick-connect coupler, and also attached a hose with a coupler to the purified water outlet nozzle, making it usable as an under-sink type. The last photo (⑧) is a picture of it actually installed. (It was attached to the outlet of a separate water purification cartridge and used in a dual-stage setup.)
This time, when updating the water purification cartridge, I decided to use a domestic product independently. Therefore, I am offering the Seagull IV water purification set to anyone who is interested and have listed it on Mercari.
The item includes the complete original water purifier set, as well as the hoses and couplers used for the simple modification to an under-sink type.
Although it is an older item, the stainless steel cartridge container has some minor scratches but no rust or dents, and is in clean condition. The hoses and the faucet attachment switching valve show some signs of age-related deterioration, but I believe they are in a condition that does not affect their use.
Additionally, a water purification cartridge will be included as a test item for installation, but please let me know if you do not need it. This cartridge was purchased in April 2011, used for half a year, then stored for 14 years, and began to be reused in April of this year. As it was installed behind another water purification cartridge for these six months, the filter's exterior is not dirty, but it has been used for a total of one year, so please consider purchasing a new one.
Below is a description of the photos:
Photos ①, ②, ③: The main unit of the water purifier, water purification cartridge, all accessories, and parts for simple modification. Photos ② and ③ show the stainless steel container opened.
Photo ④: The quick-connect coupler attached to the raw water supply hose.
Photo ⑤: The configuration for installation as an under-sink type.
Photos ⑥, ⑦: The item stored in its original box.
Photo ⑧: A photo of it installed as an under-sink type.