You are a part of Het Zinkstuk when you are either a member or a contributor. As a member you can participate in all swimming and waterpolo practices as well as all the activities. As a contributor you can only engage in activities.

The membership means a lot of fun and an excellent way to get to know other people quickly.

Membership is continuous and can be terminated throughout the year. Membership will then stop at the next unsubscribe-date.

Yes, that is possible if you study at another higher education institution in the Netherlands. It may be that you are first placed on a waiting list, so that it takes a while before you can become a member.  We suggest to sign in but don't buy a sportcard at olympos yet, buy the card if the board tell you, you can be member. For more information about the waiting list you can e-mail

You can subscribe via the registration form.

The costs for a full season 2022/2023 are displayed in the table below.

KNZB contribution
(€ 19,05)
Association fee
(€ 43,50)
Start license
(€ 37,35)
Competition fee
(around € 70)
Contributors contribution
(min. € 20)
Water polo X X

€ 62,55
Water polo + competition X X X X
€ 169,90
Swimming X X

€ 62,55
Swimming + external competition X X X

€ 99,90

X € 20,00

A new member also pays a one-time registration fee equal to the costs of the KNZB-contribution and potentially the starting fee for a start license.

KNZB contribution wil be deducted every half year and will be payed up front.

Olympos sportscardWhen you are a member of Het Zinkstuk, it is obligated to own a 6 or 12 months sportscard of Olympos (the Olympas).The Olympos sportscard has to be bought via the sportcenter Olympos and then has to be registered to Het Zinkstuk. For more information about the Olympas, go to 'Do I need an Olympos sportscard?'

Competition fee. For members who play in a waterpoloteam there's an additional competition fee of about €70,00. You also need a start license if you want to play in a waterpoloteam.

Start license swimming. For external swimming competitions (except for NSZK's and the NKS) a license is required. A license can be acquired through Zinkstuk for €37,35. Read more about the license at ''When do I need a startlicense and how does it work?'

You are obliged to have a valid Olympos sportscard registered to Het Zinkstuk during your entire membership. This does not apply for contributors and alumni.

The Olympos sportscard has to be bought via the sportcenter Olympos and then has to be registered to Het Zinkstuk. Don't know which kind of sportscard to buy? Do the check via this tool.

Arrange your Olympas via this link or the Zinkstuk-registering via this link. Your Olympas must always be at least valid until the next unsubscribe-date (valid until 31-07-XX or 31-01-XX).

When the registration of your sports card expires you will receive a message that tells you you have to extend you registration. As long as you don't have a valid and to Het Zinkstuk registered sportscard, you cannot take part in the practices and activities. If you remain in jeopardy you will receive a fine of 110% the amount Het Zinkstuk would otherwise receive for you from grants. The dates on which the board checks your sportscard are the first of November and April.

You will need a license when:

  • You are part of a waterpoloteam and play in the competition, or
  • You want to participate in KNZB-matches in addition to the NSZKs.

You can request or stop a license yourself via your profile on the website. A start licence is valid from Januari 1st till December 31st and will be automatically extended if you don't cancel it before January 1st via your profile on the website.

Contributors cannot subscribe for a start license.

The contribution is collected at the end of October and the end of February . For contributors the contribution is also collected at the end of October.

This is KNZB contribution and memberschipcontribution

Other costs, for example those for activities, are collected at the end of each month.

Costs are collected via the payment method you selected at your registration.

Two weeks before a cost collection you will receive a message containing the amount that will be collected.

In case you choose to transfer the costs yourself or when the automatic collection did not succeed, you are required to make the payment within two weeks. Contact information can be found on this page.

A maximum of three payment reminders will be sent every two weeks. The board reserves the right to suspend persons who do not fulfill their payment obligation.

The unsubscribe-dates are the outer moments to end or change your membership. These are as follows:

  • For members: December 30 and June 30.
  • For contributors: July 31.

If this means that you have only been a member for half a year this season, then it could be that you only have to pay half of the contribution fee. If you want to know more about this, send an email to

End your membership or convert it before one of these dates via this link.

As a member you are entitled to suspend your membership for half a season. You can do this once a season by sending an e-mail to In case the board honors your request you will only have to pay half the contribution. During the suspension of your membership you cannot prescribe to any of your rights as a member.

Please note that in the event of a violation you might still have to pay the entire contribution and any missed grants under penalty of suspension.

When you are no longer a student you are allowed to remain a member for one season at the regular contribution cost plus 28 euros. After that season you can apply for dispensation by sending an e-mail to If you do not do this, you will be unsubscribed automatically.

When dispensation is assigned, the default contribution becomes:

  • 1st year dispensation: €157,70
  • 2nd year dispensation: €315,00
  • After 2nd year dispensation: obligated unsubscribing

It is possible to become a contributor when your membership ends. As a contributor you can still participate in the activities and you support the association. You can stop your membership or convert it to becoming a contributor via this page.

You can unsubscribe via this page.

For members applies: after an unsubscribe-date follows a notice period of 1 month in which your membership continues. During the notice period it is not possible to participate in matches organized by the KNZB. If you want to keep participating in these matches you have to send an e-mail before the unsubscribe-date to

Are you not a student anymore? Or your membership at Het Zinkstuk comes to an end, but you still want to stay connected with the club? You can become a contributor!

With a contribution of at least €20,- you’ll have several advantages:

  • you can participate all Zinkstuk-activities around the year (except the ones during training times in the swimming pool)
  • you will still recieve the member mail and therefore be updated about whats going on in the club
  • you will contribute to the financial health of the club!

You can become a member or contributor at any time during the season.

Contributors always pay the contribution for the entire season, despite the time of registration. This means that if you register as a contributor between August 1, 2018 and July 31, 2019, you pay the entire contribution of 2018/2019.

If you become a member between February 1 and August 1, you only have to pay half of the training fee for that season. You do pay the full KNZB contribution, registration costs and eventually the costs of a start license