filtering HTML form

Hello, all.

In a form there is a <textarea> field containing HTML formatted data, which get damaged after

PHP Code:

$this->input->post('text'); 


Some sub-strings replaced by '[removed]'.

The temporary solution i found is to turn off filtering by second parameter:

PHP Code:

$this->input->post('text', false); 


Could you suggest more secure approach?   I want this filter, but i have to to deal with HTML data.