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Exhibit 4.3
 NINTH AMENDMENT TO LOAN AND SECURITY AGREEMENT
 THIS NINTH AMENDMENT TO LOAN AND SECURITY AGREEMENT Amendment Lender Lenders WELLS FARGO FOOTHILL, INC. Agent PCI CHEMICALS CANADA COMPANY PIONEER AMERICAS LLC Borrower Borrowers
 RECITALS
 Agreement
   ARTICLE I
DEFINITIONS
 Definitions
 ARTICLE II
AMENDMENTS
 Amendments to Section 1.1 of the Agreement
 Section 1.1
  2007 Indenture
 Section 1.1




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 2007 Indenture Documents
 Section 1.1
  2007 Subordinated Notes
 Section 1.1
  Indenture Documents
  Section 1.1
  Tranche B Indenture Documents
 Amendment to Section 2.12(a)(ii)
  Amendment to Section 5.22 Section 5.22
 5.22 Indenture Documents.




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Amendment to Section 6.18 Section 6.18
 6.18 Indenture Documents.
 Amendment to Section 7.1 Section 7.1
 7.1 Indebtedness.




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Amendment to Section 7.8. Section 7.8
 7.8 Prepayments and Amendments.
 Section
7.1(d)
  Amendment to Section 7.11 Section 7.11
 7.11 Distributions provided however
 Section 7.13(b)




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ARTICLE III
CONDITIONS PRECEDENT
 Conditions
  Ratification
 Loan Document Loan
Documents
     ARTICLE IV
RATIFICATIONS, REPRESENTATIONS AND WARRANTIES
 Ratifications




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Representations and Warranties
     ARTICLE V
MISCELLANEOUS
 Survival of Representations and Warranties
 Reference to Agreement
 Expenses of Agent




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RELEASE
 Severability
 APPLICABLE LAW
 Successors and Assigns
 Counterparts




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Effect of Waiver
 Headings
 FINAL AGREEMENT




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PCI CHEMICALS CANADA COMPANY
a Nova Scotia unlimited liability companyBy:
    /s/Gary L. PittmanName:
    Gary L. PittmanTitle:
    Sr. Vice President and Chief Financial OfficerPIONEER AMERICAS LLC
a Delaware limited liability companyBy:
    /s/Gary L. PittmanName:
    Gary L. PittmanTitle:
    Sr. Vice President and Chief Financial OfficerWELLS FARGO FOOTHILL, INC.,
a California corporation (f/k/a Foothill Capital Corporation),
as Agent and as a LenderBy:
    /s/Terri LeName:
    Terri LeTitle:
    Vice President




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CONSENT AND RATIFICATION
 Guarantor Guarantors Guaranty WELLS FARGO FOOTHILL, INC. Amendment PCI CHEMICALS CANADA COMPANY PIONEER AMERICAS LLC Borrower Borrowers
 Pioneer Companies, Inc.By:
    /s/Gary L. PittmanName:
    Gary L. PittmanTitle:
    Sr. Vice President and
Chief Financial OfficerPioneer (East), Inc.By:
    /s/Gary L. PittmanName:
    Gary L. PittmanTitle:
    Sr. Vice President and
Chief Financial Officer




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Pioneer Licensing, Inc.By:
    /s/Gary L. PittmanName:
    Gary L. PittmanTitle:
    Sr. Vice President and
Chief Financial OfficerImperial West Chemical Co.By:
    /s/Gary L. PittmanName:
    Gary L. PittmanTitle:
    Sr. Vice President and
Chief Financial OfficerKNA California, Inc.By:
    /s/Gary L. PittmanName:
    Gary L. PittmanTitle:
    Sr. Vice President and
Chief Financial OfficerPioneer Water Technologies, Inc.By:
    /s/Gary L. PittmanName:
    Gary L. PittmanTitle:
    Sr. Vice President and
Chief Financial OfficerKWT, Inc.By:
    /s/Gary L. PittmanName:
    Gary L. PittmanTitle:
    Sr. Vice President and
Chief Financial Officer